665357625813 has 4 divisors (see below), whose sum is σ = 887143501088. Its totient is φ = 443571750540.

The previous prime is 665357625707. The next prime is 665357625817. The reversal of 665357625813 is 318526753566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665357625813 - 2¹² = 665357621717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665357625817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110892937633 + ... + 110892937638.

It is an arithmetic number, because the mean of its divisors is an integer number (221785875272).

Almost surely, 2^665357625813 is an apocalyptic number.

It is an amenable number.

665357625813 is a deficient number, since it is larger than the sum of its proper divisors (221785875275).

665357625813 is a wasteful number, since it uses less digits than its factorization.

665357625813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221785875274.

The product of its digits is 27216000, while the sum is 57.

The spelling of 665357625813 in words is "six hundred sixty-five billion, three hundred fifty-seven million, six hundred twenty-five thousand, eight hundred thirteen".