657399883204 has 9 divisors (see below), whose sum is σ = 1150452633421. Its totient is φ = 328699130800.

The previous prime is 657399883187. The next prime is 657399883219. The reversal of 657399883204 is 402388993756.

The square root of 657399883204 is 810802.

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., 8408523204 + 648991360000 = 91698^2 + 805600^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1418904 + ... + 1824304.

Almost surely, 2^657399883204 is an apocalyptic number.

657399883204 is the 810802-nd square number.

It is an amenable number.

657399883204 is a deficient number, since it is larger than the sum of its proper divisors (493052750217).

657399883204 is an frugal number, since it uses more digits than its factorization.

657399883204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810806 (or 405403 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 64.

Multiplying 657399883204 by its sum of digits (64), we get a square (42073592525056 = 6486416²).

The spelling of 657399883204 in words is "six hundred fifty-seven billion, three hundred ninety-nine million, eight hundred eighty-three thousand, two hundred four".