664166321296 has 45 divisors (see below), whose sum is σ = 1303822878771. Its totient is φ = 327752441952.

The previous prime is 664166321257. The next prime is 664166321321. The reversal of 664166321296 is 692123661466.

The square root of 664166321296 is 814964.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×664166321296² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 257527335 + ... + 257529913.

Almost surely, 2^664166321296 is an apocalyptic number.

664166321296 is the 814964-th square number.

It is an amenable number.

664166321296 is a deficient number, since it is larger than the sum of its proper divisors (639656557475).

664166321296 is an frugal number, since it uses more digits than its factorization.

664166321296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324 (or 2660 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 52.

The spelling of 664166321296 in words is "six hundred sixty-four billion, one hundred sixty-six million, three hundred twenty-one thousand, two hundred ninety-six".