664560877431 has 32 divisors (see below), whose sum is σ = 971112430080. Its totient is φ = 400899340800.

The previous prime is 664560877411. The next prime is 664560877447. The reversal of 664560877431 is 134778065466.

It is not a de Polignac number, because 664560877431 - 2¹⁸ = 664560615287 is a prime.

It is a super-2 number, since 2×664560877431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664560877411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25506771 + ... + 25532811.

It is an arithmetic number, because the mean of its divisors is an integer number (30347263440).

Almost surely, 2^664560877431 is an apocalyptic number.

664560877431 is a deficient number, since it is larger than the sum of its proper divisors (306551552649).

664560877431 is a wasteful number, since it uses less digits than its factorization.

664560877431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29607.

The product of its (nonzero) digits is 20321280, while the sum is 57.

The spelling of 664560877431 in words is "six hundred sixty-four billion, five hundred sixty million, eight hundred seventy-seven thousand, four hundred thirty-one".