166577768043986 has 16 divisors (see below), whose sum is σ = 278366031480600. Its totient is φ = 74230941727488.

The previous prime is 166577768043959. The next prime is 166577768044007. The reversal of 166577768043986 is 689340867775661.

It can be written as a sum of positive squares in 4 ways, for example, as 151962202017025 + 14615566026961 = 12327295^2 + 3823031^2 .

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, 110462710151 + ... + 110462711658.

Almost surely, 2^{166577768043986} is an apocalyptic number.

166577768043986 is a deficient number, since it is larger than the sum of its proper divisors (111788263436614).

166577768043986 is a wasteful number, since it uses less digits than its factorization.

166577768043986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220925421853.

The product of its (nonzero) digits is 15362887680, while the sum is 83.

The spelling of 166577768043986 in words is "one hundred sixty-six trillion, five hundred seventy-seven billion, seven hundred sixty-eight million, forty-three thousand, nine hundred eighty-six".