664039192996 has 27 divisors (see below), whose sum is σ = 1187456489569. Its totient is φ = 324917865008.

The previous prime is 664039192991. The next prime is 664039193011. The reversal of 664039192996 is 699291930466.

The square root of 664039192996 is 814886.

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

It can be written as a sum of positive squares in only one way, i.e., 295298775396 + 368740417600 = 543414^2 + 607240^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664039192991) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76594950 + ... + 76603618.

Almost surely, 2^664039192996 is an apocalyptic number.

664039192996 is the 814886-th square number.

It is an amenable number.

664039192996 is a deficient number, since it is larger than the sum of its proper divisors (523417296573).

664039192996 is an frugal number, since it uses more digits than its factorization.

664039192996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17436 (or 8718 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 64.

Multiplying 664039192996 by its sum of digits (64), we get a square (42498508351744 = 6519088²).

The spelling of 664039192996 in words is "six hundred sixty-four billion, thirty-nine million, one hundred ninety-two thousand, nine hundred ninety-six".