166577768043987 has 16 divisors (see below), whose sum is σ = 222224937704352. Its totient is φ = 110991227397120.

The previous prime is 166577768043959. The next prime is 166577768044007. The reversal of 166577768043987 is 789340867775661.

It is not a de Polignac number, because 166577768043987 - 2⁶ = 166577768043923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166577768043187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121919953 + ... + 123278669.

It is an arithmetic number, because the mean of its divisors is an integer number (13889058606522).

Almost surely, 2^{166577768043987} is an apocalyptic number.

166577768043987 is a deficient number, since it is larger than the sum of its proper divisors (55647169660365).

166577768043987 is a wasteful number, since it uses less digits than its factorization.

166577768043987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380998.

The product of its (nonzero) digits is 17923368960, while the sum is 84.

The spelling of 166577768043987 in words is "one hundred sixty-six trillion, five hundred seventy-seven billion, seven hundred sixty-eight million, forty-three thousand, nine hundred eighty-seven".