166557663798 has 16 divisors (see below), whose sum is σ = 333246972096. Its totient is φ = 55497280520.

The previous prime is 166557663739. The next prime is 166557663817. The reversal of 166557663798 is 897366755661.

It is a congruent number.

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, 5468736 + ... + 5499107.

It is an arithmetic number, because the mean of its divisors is an integer number (20827935756).

Almost surely, 2^166557663798 is an apocalyptic number.

166557663798 is an abundant number, since it is smaller than the sum of its proper divisors (166689308298).

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

166557663798 is a wasteful number, since it uses less digits than its factorization.

166557663798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10970379.

The product of its digits is 342921600, while the sum is 69.

The spelling of 166557663798 in words is "one hundred sixty-six billion, five hundred fifty-seven million, six hundred sixty-three thousand, seven hundred ninety-eight".