165861157102179 has 32 divisors (see below), whose sum is σ = 278447121953280. Its totient is φ = 85308554496000.

The previous prime is 165861157102057. The next prime is 165861157102219. The reversal of 165861157102179 is 971201751168561.

It is not a de Polignac number, because 165861157102179 - 2⁷ = 165861157102051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165861157102579) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3554499774 + ... + 3554546435.

It is an arithmetic number, because the mean of its divisors is an integer number (8701472561040).

Almost surely, 2^{165861157102179} is an apocalyptic number.

165861157102179 is a deficient number, since it is larger than the sum of its proper divisors (112585964851101).

165861157102179 is a wasteful number, since it uses less digits than its factorization.

165861157102179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7109046331.

The product of its (nonzero) digits is 6350400, while the sum is 60.

The spelling of 165861157102179 in words is "one hundred sixty-five trillion, eight hundred sixty-one billion, one hundred fifty-seven million, one hundred two thousand, one hundred seventy-nine".