665249360831 has 32 divisors (see below), whose sum is σ = 796524503040. Its totient is φ = 548530214400.

The previous prime is 665249360803. The next prime is 665249360851. The reversal of 665249360831 is 138063942566.

It is not a de Polignac number, because 665249360831 - 2¹⁸ = 665249098687 is a prime.

It is a super-2 number, since 2×665249360831² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665249360851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1145405 + ... + 1625561.

It is an arithmetic number, because the mean of its divisors is an integer number (24891390720).

Almost surely, 2^665249360831 is an apocalyptic number.

665249360831 is a deficient number, since it is larger than the sum of its proper divisors (131275142209).

665249360831 is a wasteful number, since it uses less digits than its factorization.

665249360831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480455.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 665249360831 in words is "six hundred sixty-five billion, two hundred forty-nine million, three hundred sixty thousand, eight hundred thirty-one".