166815563676 has 24 divisors (see below), whose sum is σ = 399756216720. Its totient is φ = 54102344832.

The previous prime is 166815563657. The next prime is 166815563701. The reversal of 166815563676 is 676365518661.

It is a super-2 number, since 2×166815563676² (a number of 23 digits) contains 22 as substring.

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, 187854921 + ... + 187855808.

It is an arithmetic number, because the mean of its divisors is an integer number (16656509030).

Almost surely, 2^166815563676 is an apocalyptic number.

It is an amenable number.

166815563676 is an abundant number, since it is smaller than the sum of its proper divisors (232940653044).

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

166815563676 is a wasteful number, since it uses less digits than its factorization.

166815563676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375710773 (or 375710771 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 60.

The spelling of 166815563676 in words is "one hundred sixty-six billion, eight hundred fifteen million, five hundred sixty-three thousand, six hundred seventy-six".