7699731475921 has 9 divisors (see below), whose sum is σ = 7892226864283. Its totient is φ = 7511822153680.

The previous prime is 7699731475673. The next prime is 7699731475927. The reversal of 7699731475921 is 1295741379967.

The square root of 7699731475921 is 2774839.

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., 371016210321 + 7328715265600 = 609111^2 + 2707160^2 .

It is not a de Polignac number, because 7699731475921 - 2⁹ = 7699731475409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7699731475927) 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, 113734560 + ... + 113802238.

Almost surely, 2^{7699731475921} is an apocalyptic number.

7699731475921 is the 2774839-th square number.

7699731475921 is the 1387420-th centered octagonal number.

It is an amenable number.

7699731475921 is a deficient number, since it is larger than the sum of its proper divisors (192495388362).

7699731475921 is an frugal number, since it uses more digits than its factorization.

7699731475921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135440 (or 67720 counting only the distinct ones).

The product of its digits is 180033840, while the sum is 70.

The spelling of 7699731475921 in words is "seven trillion, six hundred ninety-nine billion, seven hundred thirty-one million, four hundred seventy-five thousand, nine hundred twenty-one".