167165021 has 12 divisors (see below), whose sum is σ = 179775612. Its totient is φ = 155361024.

The previous prime is 167165017. The next prime is 167165023. The reversal of 167165021 is 120561761.

It can be written as a sum of positive squares in 2 ways, for example, as 92428996 + 74736025 = 9614^2 + 8645^2 .

It is not a de Polignac number, because 167165021 - 2² = 167165017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167165023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14765 + ... + 23501.

It is an arithmetic number, because the mean of its divisors is an integer number (14981301).

Almost surely, 2^167165021 is an apocalyptic number.

It is an amenable number.

167165021 is a deficient number, since it is larger than the sum of its proper divisors (12610591).

167165021 is an equidigital number, since it uses as much as digits as its factorization.

167165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8828 (or 8809 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 167165021 is about 12929.2312609838. The cubic root of 167165021 is about 550.8691722685.

The spelling of 167165021 in words is "one hundred sixty-seven million, one hundred sixty-five thousand, twenty-one".