18226620036 has 27 divisors (see below), whose sum is σ = 46074892773. Its totient is φ = 6075270000.

The previous prime is 18226620019. The next prime is 18226620037. The reversal of 18226620036 is 63002662281.

The square root of 18226620036 is 135006.

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

18226620036 is a `hidden beast` number, since 1 + 8 + 2 + 26 + 620 + 0 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18223380036 + 3240000 = 134994^2 + 1800^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18226620037) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 798786 + ... + 821286.

Almost surely, 2^18226620036 is an apocalyptic number.

18226620036 is the 135006-th square number.

It is an amenable number.

18226620036 is an abundant number, since it is smaller than the sum of its proper divisors (27848272737).

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

18226620036 is an frugal number, since it uses more digits than its factorization.

18226620036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45012 (or 22506 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Multiplying 18226620036 by its sum of digits (36), we get a square (656158321296 = 810036²).

18226620036 divided by its sum of digits (36) gives a square (506295001 = 22501²).

The spelling of 18226620036 in words is "eighteen billion, two hundred twenty-six million, six hundred twenty thousand, thirty-six".