165623251089 has 16 divisors (see below), whose sum is σ = 227968753664. Its totient is φ = 106847067600.

The previous prime is 165623251067. The next prime is 165623251093. The reversal of 165623251089 is 980152326561.

It is not a de Polignac number, because 165623251089 - 2⁸ = 165623250833 is a prime.

It is a super-2 number, since 2×165623251089² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165623251039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1770792 + ... + 1861974.

It is an arithmetic number, because the mean of its divisors is an integer number (14248047104).

Almost surely, 2^165623251089 is an apocalyptic number.

It is an amenable number.

165623251089 is a deficient number, since it is larger than the sum of its proper divisors (62345502575).

165623251089 is a wasteful number, since it uses less digits than its factorization.

165623251089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110748.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 165623251089 in words is "one hundred sixty-five billion, six hundred twenty-three million, two hundred fifty-one thousand, eighty-nine".