165251263 has 2 divisors, whose sum is σ = 165251264. Its totient is φ = 165251262.

The previous prime is 165251249. The next prime is 165251267. The reversal of 165251263 is 362152561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165251263 - 2⁵ = 165251231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165251267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82625631 + 82625632.

It is an arithmetic number, because the mean of its divisors is an integer number (82625632).

Almost surely, 2^165251263 is an apocalyptic number.

165251263 is a deficient number, since it is larger than the sum of its proper divisors (1).

165251263 is an equidigital number, since it uses as much as digits as its factorization.

165251263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 165251263 is about 12855.0092570951. The cubic root of 165251263 is about 548.7589239299.

The spelling of 165251263 in words is "one hundred sixty-five million, two hundred fifty-one thousand, two hundred sixty-three".