156217990956 has 24 divisors (see below), whose sum is σ = 383693311680. Its totient is φ = 49331997072.

The previous prime is 156217990909. The next prime is 156217990969. The reversal of 156217990956 is 659099712651.

It is a self number, because there is not a number n which added to its sum of digits gives 156217990956.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342583086 + ... + 342583541.

It is an arithmetic number, because the mean of its divisors is an integer number (15987221320).

Almost surely, 2^156217990956 is an apocalyptic number.

It is an amenable number.

156217990956 is an abundant number, since it is smaller than the sum of its proper divisors (227475320724).

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

156217990956 is a wasteful number, since it uses less digits than its factorization.

156217990956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685166653 (or 685166651 counting only the distinct ones).

The product of its (nonzero) digits is 9185400, while the sum is 60.

The spelling of 156217990956 in words is "one hundred fifty-six billion, two hundred seventeen million, nine hundred ninety thousand, nine hundred fifty-six".