165500501 has 2 divisors, whose sum is σ = 165500502. Its totient is φ = 165500500.

The previous prime is 165500483. The next prime is 165500509. The reversal of 165500501 is 105005561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110355025 + 55145476 = 10505^2 + 7426^2 .

It is a cyclic number.

It is not a de Polignac number, because 165500501 - 2¹⁸ = 165238357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165500509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82750250 + 82750251.

It is an arithmetic number, because the mean of its divisors is an integer number (82750251).

Almost surely, 2^165500501 is an apocalyptic number.

It is an amenable number.

165500501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165500501 is an equidigital number, since it uses as much as digits as its factorization.

165500501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 165500501 is about 12864.6998021718. The cubic root of 165500501 is about 549.0346714400.

The spelling of 165500501 in words is "one hundred sixty-five million, five hundred thousand, five hundred one".