900856520181 has 16 divisors (see below), whose sum is σ = 1334832073920. Its totient is φ = 600467593680.

The previous prime is 900856520171. The next prime is 900856520227. The reversal of 900856520181 is 181025658009.

It is a happy number.

900856520181 is a `hidden beast` number, since 9 + 0 + 0 + 8 + 565 + 2 + 0 + 1 + 81 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-900856520181 is a prime.

It is a super-2 number, since 2×900856520181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900856520171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2712915 + ... + 3026816.

It is an arithmetic number, because the mean of its divisors is an integer number (83427004620).

Almost surely, 2^900856520181 is an apocalyptic number.

It is an amenable number.

900856520181 is a deficient number, since it is larger than the sum of its proper divisors (433975553739).

900856520181 is a wasteful number, since it uses less digits than its factorization.

900856520181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745553 (or 5745547 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 900856520181 in words is "nine hundred billion, eight hundred fifty-six million, five hundred twenty thousand, one hundred eighty-one".