637979197696 has 27 divisors (see below), whose sum is σ = 1273491799293. Its totient is φ = 318983208960.

The previous prime is 637979197663. The next prime is 637979197697. The reversal of 637979197696 is 696791979736.

The square root of 637979197696 is 798736.

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., 562596004096 + 75383193600 = 750064^2 + 274560^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (637979197697) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12754816 + ... + 12804736.

Almost surely, 2^637979197696 is an apocalyptic number.

637979197696 is the 798736-th square number.

It is an amenable number.

637979197696 is a deficient number, since it is larger than the sum of its proper divisors (635512601597).

637979197696 is an frugal number, since it uses more digits than its factorization.

637979197696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99858 (or 49923 counting only the distinct ones).

The product of its digits is 1458274104, while the sum is 79.

The spelling of 637979197696 in words is "six hundred thirty-seven billion, nine hundred seventy-nine million, one hundred ninety-seven thousand, six hundred ninety-six".