664876549531 has 4 divisors (see below), whose sum is σ = 669659834200. Its totient is φ = 660093264864.

The previous prime is 664876549523. The next prime is 664876549543. The reversal of 664876549531 is 135945678466.

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 664876549531 - 2³ = 664876549523 is a prime.

It is a super-2 number, since 2×664876549531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664876549031) 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, 2391642126 + ... + 2391642403.

It is an arithmetic number, because the mean of its divisors is an integer number (167414958550).

Almost surely, 2^664876549531 is an apocalyptic number.

664876549531 is a deficient number, since it is larger than the sum of its proper divisors (4783284669).

664876549531 is a wasteful number, since it uses less digits than its factorization.

664876549531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4783284668.

The product of its digits is 130636800, while the sum is 64.

The spelling of 664876549531 in words is "six hundred sixty-four billion, eight hundred seventy-six million, five hundred forty-nine thousand, five hundred thirty-one".