165504491 has 2 divisors, whose sum is σ = 165504492. Its totient is φ = 165504490.

The previous prime is 165504487. The next prime is 165504523. The reversal of 165504491 is 194405561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165504491 - 2² = 165504487 is a prime.

It is not a weakly prime, because it can be changed into another prime (165504191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82752245 + 82752246.

It is an arithmetic number, because the mean of its divisors is an integer number (82752246).

Almost surely, 2^165504491 is an apocalyptic number.

165504491 is a deficient number, since it is larger than the sum of its proper divisors (1).

165504491 is an equidigital number, since it uses as much as digits as its factorization.

165504491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 165504491 is about 12864.8548767563. The cubic root of 165504491 is about 549.0390835732.

The spelling of 165504491 in words is "one hundred sixty-five million, five hundred four thousand, four hundred ninety-one".