165584557 has 2 divisors, whose sum is σ = 165584558. Its totient is φ = 165584556.

The previous prime is 165584477. The next prime is 165584569. The reversal of 165584557 is 755485561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110439081 + 55145476 = 10509^2 + 7426^2 .

It is an emirp because it is prime and its reverse (755485561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165584557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165584057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82792278 + 82792279.

It is an arithmetic number, because the mean of its divisors is an integer number (82792279).

Almost surely, 2^165584557 is an apocalyptic number.

It is an amenable number.

165584557 is a deficient number, since it is larger than the sum of its proper divisors (1).

165584557 is an equidigital number, since it uses as much as digits as its factorization.

165584557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840000, while the sum is 46.

The square root of 165584557 is about 12867.9663117371. The cubic root of 165584557 is about 549.1276053935.

It can be divided in two parts, 16558 and 4557, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 165584557 in words is "one hundred sixty-five million, five hundred eighty-four thousand, five hundred fifty-seven".