664268879475 has 72 divisors (see below), whose sum is σ = 1204293991680. Its totient is φ = 349962370560.

The previous prime is 664268879471. The next prime is 664268879479. The reversal of 664268879475 is 574978862466.

664268879475 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 6 + 88 + 79 + 475 = 666.

664268879475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664268879471) and next prime (664268879479).

It is not a de Polignac number, because 664268879475 - 2² = 664268879471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664268879471) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 21751917 + ... + 21782433.

It is an arithmetic number, because the mean of its divisors is an integer number (16726305440).

Almost surely, 2^664268879475 is an apocalyptic number.

664268879475 is a deficient number, since it is larger than the sum of its proper divisors (540025112205).

664268879475 is a wasteful number, since it uses less digits than its factorization.

664268879475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31709 (or 31701 counting only the distinct ones).

The product of its digits is 975421440, while the sum is 72.

The spelling of 664268879475 in words is "six hundred sixty-four billion, two hundred sixty-eight million, eight hundred seventy-nine thousand, four hundred seventy-five".