665131024880 has 40 divisors (see below), whose sum is σ = 1767348153312. Its totient is φ = 228044922624.

The previous prime is 665131024871. The next prime is 665131024913. The reversal of 665131024880 is 88420131566.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593866427 + ... + 593867546.

Almost surely, 2^665131024880 is an apocalyptic number.

It is an amenable number.

665131024880 is an abundant number, since it is smaller than the sum of its proper divisors (1102217128432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665131024880 is a wasteful number, since it uses less digits than its factorization.

665131024880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187733993 (or 1187733987 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 665131024880 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-four thousand, eight hundred eighty".