715913977689 has 45 divisors (see below), whose sum is σ = 1096650393069. Its totient is φ = 465432039360.

The previous prime is 715913977661. The next prime is 715913977693. The reversal of 715913977689 is 986779319517.

The square root of 715913977689 is 846117.

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

715913977689 is a `hidden beast` number, since 7 + 1 + 5 + 91 + 397 + 76 + 89 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 354602385225 + 361311592464 = 595485^2 + 601092^2 .

It is a de Polignac number, because none of the positive numbers 2^k-715913977689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (715913977189) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 312216027 + ... + 312218319.

Almost surely, 2^715913977689 is an apocalyptic number.

715913977689 is the 846117-th square number.

715913977689 is the 423059-th centered octagonal number.

It is an amenable number.

715913977689 is a deficient number, since it is larger than the sum of its proper divisors (380736415380).

715913977689 is an frugal number, since it uses more digits than its factorization.

715913977689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680 (or 2337 counting only the distinct ones).

The product of its digits is 180033840, while the sum is 72.

The spelling of 715913977689 in words is "seven hundred fifteen billion, nine hundred thirteen million, nine hundred seventy-seven thousand, six hundred eighty-nine".