665131024879 has 4 divisors (see below), whose sum is σ = 665802197440. Its totient is φ = 664459852320.

The previous prime is 665131024871. The next prime is 665131024913. The reversal of 665131024879 is 978420131566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665131024879 - 2³ = 665131024871 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 335584794 + ... + 335586775.

It is an arithmetic number, because the mean of its divisors is an integer number (166450549360).

It is a 2-persistent number, because it is pandigital, and so is 2⋅665131024879 = 1330262049758, but 3⋅665131024879 = 1995393074637 is not.

Almost surely, 2^665131024879 is an apocalyptic number.

665131024879 is a deficient number, since it is larger than the sum of its proper divisors (671172561).

665131024879 is an equidigital number, since it uses as much as digits as its factorization.

665131024879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671172560.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 665131024879 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-four thousand, eight hundred seventy-nine".