664860830427 has 8 divisors (see below), whose sum is σ = 984979008080. Its totient is φ = 443240553600.

The previous prime is 664860830393. The next prime is 664860830471. The reversal of 664860830427 is 724038068466.

664860830427 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 608 + 3 + 0 + 4 + 27 = 666.

It is not a de Polignac number, because 664860830427 - 2³⁴ = 647680961243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664860830827) 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, 12312237574 + ... + 12312237627.

It is an arithmetic number, because the mean of its divisors is an integer number (123122376010).

Almost surely, 2^664860830427 is an apocalyptic number.

664860830427 is a deficient number, since it is larger than the sum of its proper divisors (320118177653).

664860830427 is a wasteful number, since it uses less digits than its factorization.

664860830427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24624475210 (or 24624475204 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 54.

The spelling of 664860830427 in words is "six hundred sixty-four billion, eight hundred sixty million, eight hundred thirty thousand, four hundred twenty-seven".