18010725444 has 36 divisors (see below), whose sum is σ = 45540151020. Its totient is φ = 6001855680.

The previous prime is 18010725443. The next prime is 18010725457. The reversal of 18010725444 is 44452701081.

It is a happy number.

18010725444 is a `hidden beast` number, since 1 + 8 + 0 + 107 + 2 + 544 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16332840000 + 1677885444 = 127800^2 + 40962^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×18010725444³ (a number of 32 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 18010725399 and 18010725408.

It is not an unprimeable number, because it can be changed into a prime (18010725443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59062 + ... + 198770.

It is an arithmetic number, because the mean of its divisors is an integer number (1265004195).

Almost surely, 2^18010725444 is an apocalyptic number.

It is an amenable number.

18010725444 is an abundant number, since it is smaller than the sum of its proper divisors (27529425576).

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

18010725444 is a wasteful number, since it uses less digits than its factorization.

18010725444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143300 (or 143295 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 18010725444 in words is "eighteen billion, ten million, seven hundred twenty-five thousand, four hundred forty-four".