664473186434 has 4 divisors (see below), whose sum is σ = 996709779654. Its totient is φ = 332236593216.

The previous prime is 664473186401. The next prime is 664473186479. The reversal of 664473186434 is 434681374466.

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

It can be written as a sum of positive squares in only one way, i.e., 444826304209 + 219646882225 = 666953^2 + 468665^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664473186434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166118296607 + ... + 166118296610.

Almost surely, 2^664473186434 is an apocalyptic number.

664473186434 is a deficient number, since it is larger than the sum of its proper divisors (332236593220).

664473186434 is a wasteful number, since it uses less digits than its factorization.

664473186434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332236593219.

The product of its digits is 27869184, while the sum is 56.

The spelling of 664473186434 in words is "six hundred sixty-four billion, four hundred seventy-three million, one hundred eighty-six thousand, four hundred thirty-four".