397664738896 has 10 divisors (see below), whose sum is σ = 770475431642. Its totient is φ = 198832369440.

The previous prime is 397664738833. The next prime is 397664738897. The reversal of 397664738896 is 698837466793.

It can be written as a sum of positive squares in only one way, i.e., 356007928896 + 41656810000 = 596664^2 + 204100^2 .

It is a super-2 number, since 2×397664738896² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397664738897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12427023075 + ... + 12427023106.

Almost surely, 2^397664738896 is an apocalyptic number.

It is an amenable number.

397664738896 is a deficient number, since it is larger than the sum of its proper divisors (372810692746).

397664738896 is a wasteful number, since it uses less digits than its factorization.

397664738896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24854046189 (or 24854046183 counting only the distinct ones).

The product of its digits is 1975228416, while the sum is 76.

The spelling of 397664738896 in words is "three hundred ninety-seven billion, six hundred sixty-four million, seven hundred thirty-eight thousand, eight hundred ninety-six".