665131024870 has 16 divisors (see below), whose sum is σ = 1289330910000. Its totient is φ = 245586839904.

The previous prime is 665131024861. The next prime is 665131024871. The reversal of 665131024870 is 78420131566.

665131024870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665131024871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2558196120 + ... + 2558196379.

It is an arithmetic number, because the mean of its divisors is an integer number (80583181875).

Almost surely, 2^665131024870 is an apocalyptic number.

665131024870 is a deficient number, since it is larger than the sum of its proper divisors (624199885130).

665131024870 is a wasteful number, since it uses less digits than its factorization.

665131024870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116392519.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 665131024870 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-four thousand, eight hundred seventy".