165515810459 has 16 divisors (see below), whose sum is σ = 167124672000. Its totient is φ = 163916685504.

The previous prime is 165515810381. The next prime is 165515810479. The reversal of 165515810459 is 954018515561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165515810459 is a prime.

It is a super-2 number, since 2×165515810459² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165515810479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40795559 + ... + 40799615.

It is an arithmetic number, because the mean of its divisors is an integer number (10445292000).

Almost surely, 2^165515810459 is an apocalyptic number.

165515810459 is a deficient number, since it is larger than the sum of its proper divisors (1608861541).

165515810459 is a wasteful number, since it uses less digits than its factorization.

165515810459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162.

The product of its (nonzero) digits is 1080000, while the sum is 50.

The spelling of 165515810459 in words is "one hundred sixty-five billion, five hundred fifteen million, eight hundred ten thousand, four hundred fifty-nine".