665040312915 has 32 divisors (see below), whose sum is σ = 1163635891200. Its totient is φ = 321655384320.

The previous prime is 665040312913. The next prime is 665040312961. The reversal of 665040312915 is 519213040566.

It is not a de Polignac number, because 665040312915 - 2¹ = 665040312913 is a prime.

It is a super-2 number, since 2×665040312915² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665040312913) 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, 4859835 + ... + 4994804.

It is an arithmetic number, because the mean of its divisors is an integer number (36363621600).

Almost surely, 2^665040312915 is an apocalyptic number.

665040312915 is a deficient number, since it is larger than the sum of its proper divisors (498595578285).

665040312915 is a wasteful number, since it uses less digits than its factorization.

665040312915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9855067.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 665040312915 in words is "six hundred sixty-five billion, forty million, three hundred twelve thousand, nine hundred fifteen".