165500557 has 2 divisors, whose sum is σ = 165500558. Its totient is φ = 165500556.

The previous prime is 165500551. The next prime is 165500567. The reversal of 165500557 is 755005561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162282121 + 3218436 = 12739^2 + 1794^2 .

It is a cyclic number.

It is not a de Polignac number, because 165500557 - 2³ = 165500549 is a prime.

It is equal to p_9265345 and since 165500557 and 9265345 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165500551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82750278 + 82750279.

It is an arithmetic number, because the mean of its divisors is an integer number (82750279).

Almost surely, 2^165500557 is an apocalyptic number.

It is an amenable number.

165500557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165500557 is an equidigital number, since it uses as much as digits as its factorization.

165500557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 165500557 is about 12864.7019786702. The cubic root of 165500557 is about 549.0347333652.

The spelling of 165500557 in words is "one hundred sixty-five million, five hundred thousand, five hundred fifty-seven".