165374557 has 2 divisors, whose sum is σ = 165374558. Its totient is φ = 165374556.

The previous prime is 165374543. The next prime is 165374563. The reversal of 165374557 is 755473561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161645796 + 3728761 = 12714^2 + 1931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165374557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165374567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82687278 + 82687279.

It is an arithmetic number, because the mean of its divisors is an integer number (82687279).

Almost surely, 2^165374557 is an apocalyptic number.

It is an amenable number.

165374557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165374557 is an equidigital number, since it uses as much as digits as its factorization.

165374557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441000, while the sum is 43.

The square root of 165374557 is about 12859.8039254104. The cubic root of 165374557 is about 548.8953663828.

The spelling of 165374557 in words is "one hundred sixty-five million, three hundred seventy-four thousand, five hundred fifty-seven".