156221643423664 has 80 divisors (see below), whose sum is σ = 372538663624512. Its totient is φ = 61800288390144.

The previous prime is 156221643423647. The next prime is 156221643423683. The reversal of 156221643423664 is 466324346122651.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52800282 + ... + 55680454.

Almost surely, 2^{156221643423664} is an apocalyptic number.

156221643423664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

156221643423664 is an abundant number, since it is smaller than the sum of its proper divisors (216317020200848).

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

156221643423664 is a wasteful number, since it uses less digits than its factorization.

156221643423664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917454 (or 2917448 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 55.

The spelling of 156221643423664 in words is "one hundred fifty-six trillion, two hundred twenty-one billion, six hundred forty-three million, four hundred twenty-three thousand, six hundred sixty-four".