665131008807 has 24 divisors (see below), whose sum is σ = 963253612464. Its totient is φ = 442264074624.

The previous prime is 665131008797. The next prime is 665131008809. The reversal of 665131008807 is 708800131566.

It is not a de Polignac number, because 665131008807 - 2⁷ = 665131008679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665131008809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6092163 + ... + 6200379.

It is an arithmetic number, because the mean of its divisors is an integer number (40135567186).

Almost surely, 2^665131008807 is an apocalyptic number.

665131008807 is a deficient number, since it is larger than the sum of its proper divisors (298122603657).

665131008807 is a wasteful number, since it uses less digits than its factorization.

665131008807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109999 (or 109996 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 665131008807 in words is "six hundred sixty-five billion, one hundred thirty-one million, eight thousand, eight hundred seven".