165261623 has 2 divisors, whose sum is σ = 165261624. Its totient is φ = 165261622.

The previous prime is 165261619. The next prime is 165261631. The reversal of 165261623 is 326162561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165261623 - 2² = 165261619 is a prime.

It is a super-2 number, since 2×165261623² = 54622808073188258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165261623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165261673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82630811 + 82630812.

It is an arithmetic number, because the mean of its divisors is an integer number (82630812).

Almost surely, 2^165261623 is an apocalyptic number.

165261623 is a deficient number, since it is larger than the sum of its proper divisors (1).

165261623 is an equidigital number, since it uses as much as digits as its factorization.

165261623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 165261623 is about 12855.4122065378. The cubic root of 165261623 is about 548.7703913635.

The spelling of 165261623 in words is "one hundred sixty-five million, two hundred sixty-one thousand, six hundred twenty-three".