18100473444 has 81 divisors (see below), whose sum is σ = 48640579897. Its totient is φ = 5674274688.

The previous prime is 18100473389. The next prime is 18100473473. The reversal of 18100473444 is 44437400181.

It is a happy number.

The square root of 18100473444 is 134538.

It is a perfect power (a square), and thus also a powerful number.

18100473444 is a `hidden beast` number, since 181 + 0 + 0 + 473 + 4 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14092064100 + 4008409344 = 118710^2 + 63312^2 .

It is a super-2 number, since 2×18100473444² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18100473399 and 18100473408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 13722217 + ... + 13723535.

Almost surely, 2^18100473444 is an apocalyptic number.

18100473444 is the 134538-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18100473444

18100473444 is an abundant number, since it is smaller than the sum of its proper divisors (30540106453).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18100473444 is a wasteful number, since it uses less digits than its factorization.

18100473444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

Multiplying 18100473444 by its sum of digits (36), we get a square (651617043984 = 807228²).

18100473444 divided by its sum of digits (36) gives a square (502790929 = 22423²).

The spelling of 18100473444 in words is "eighteen billion, one hundred million, four hundred seventy-three thousand, four hundred forty-four".