165172157 has 2 divisors, whose sum is σ = 165172158. Its totient is φ = 165172156.

The previous prime is 165172141. The next prime is 165172207. The reversal of 165172157 is 751271561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83649316 + 81522841 = 9146^2 + 9029^2 .

It is a cyclic number.

It is not a de Polignac number, because 165172157 - 2⁴ = 165172141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165172127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82586078 + 82586079.

It is an arithmetic number, because the mean of its divisors is an integer number (82586079).

Almost surely, 2^165172157 is an apocalyptic number.

It is an amenable number.

165172157 is a deficient number, since it is larger than the sum of its proper divisors (1).

165172157 is an equidigital number, since it uses as much as digits as its factorization.

165172157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 35.

The square root of 165172157 is about 12851.9320337450. The cubic root of 165172157 is about 548.6713460776.

The spelling of 165172157 in words is "one hundred sixty-five million, one hundred seventy-two thousand, one hundred fifty-seven".