664437571133476 has 48 divisors (see below), whose sum is σ = 1330705145289856. Its totient is φ = 284366892513024.

The previous prime is 664437571133359. The next prime is 664437571133669. The reversal of 664437571133476 is 674331175734466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206267350 + ... + 209463826.

Almost surely, 2^{664437571133476} is an apocalyptic number.

It is an amenable number.

664437571133476 is an abundant number, since it is smaller than the sum of its proper divisors (666267574156380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664437571133476 is a wasteful number, since it uses less digits than its factorization.

664437571133476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206708 (or 3206706 counting only the distinct ones).

The product of its digits is 640120320, while the sum is 67.

The spelling of 664437571133476 in words is "six hundred sixty-four trillion, four hundred thirty-seven billion, five hundred seventy-one million, one hundred thirty-three thousand, four hundred seventy-six".