165907272989 has 2 divisors, whose sum is σ = 165907272990. Its totient is φ = 165907272988.

The previous prime is 165907272953. The next prime is 165907272991. The reversal of 165907272989 is 989272709561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101548656889 + 64358616100 = 318667^2 + 253690^2 .

It is an emirp because it is prime and its reverse (989272709561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165907272989 - 2³² = 161612305693 is a prime.

Together with 165907272991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165907274989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82953636494 + 82953636495.

It is an arithmetic number, because the mean of its divisors is an integer number (82953636495).

Almost surely, 2^165907272989 is an apocalyptic number.

It is an amenable number.

165907272989 is a deficient number, since it is larger than the sum of its proper divisors (1).

165907272989 is an equidigital number, since it uses as much as digits as its factorization.

165907272989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 165907272989 in words is "one hundred sixty-five billion, nine hundred seven million, two hundred seventy-two thousand, nine hundred eighty-nine".