664712692670 has 128 divisors (see below), whose sum is σ = 1341436723200. Its totient is φ = 235556439552.

The previous prime is 664712692663. The next prime is 664712692691. The reversal of 664712692670 is 76296217466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109342691 + ... + 109348769.

It is an arithmetic number, because the mean of its divisors is an integer number (10479974400).

Almost surely, 2^664712692670 is an apocalyptic number.

664712692670 is an abundant number, since it is smaller than the sum of its proper divisors (676724030530).

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

664712692670 is a wasteful number, since it uses less digits than its factorization.

664712692670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6442.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 664712692670 in words is "six hundred sixty-four billion, seven hundred twelve million, six hundred ninety-two thousand, six hundred seventy".