155657221164 has 72 divisors (see below), whose sum is σ = 417304978272. Its totient is φ = 48816218880.

The previous prime is 155657221163. The next prime is 155657221183. The reversal of 155657221164 is 461122756551.

155657221164 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 572 + 2 + 11 + 64 = 666.

It is not an unprimeable number, because it can be changed into a prime (155657221163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1490409 + ... + 1591424.

It is an arithmetic number, because the mean of its divisors is an integer number (5795902476).

Almost surely, 2^155657221164 is an apocalyptic number.

It is an amenable number.

155657221164 is an abundant number, since it is smaller than the sum of its proper divisors (261647757108).

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

155657221164 is a wasteful number, since it uses less digits than its factorization.

155657221164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081927 (or 3081922 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 155657221164 in words is "one hundred fifty-five billion, six hundred fifty-seven million, two hundred twenty-one thousand, one hundred sixty-four".