165172639 has 2 divisors, whose sum is σ = 165172640. Its totient is φ = 165172638.

The previous prime is 165172633. The next prime is 165172703. The reversal of 165172639 is 936271561.

It is a weak prime.

It is an emirp because it is prime and its reverse (936271561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165172639 - 2⁹ = 165172127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165172633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82586319 + 82586320.

It is an arithmetic number, because the mean of its divisors is an integer number (82586320).

Almost surely, 2^165172639 is an apocalyptic number.

165172639 is a deficient number, since it is larger than the sum of its proper divisors (1).

165172639 is an equidigital number, since it uses as much as digits as its factorization.

165172639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 165172639 is about 12851.9507857757. The cubic root of 165172639 is about 548.6718797820.

The spelling of 165172639 in words is "one hundred sixty-five million, one hundred seventy-two thousand, six hundred thirty-nine".