715839665 has 4 divisors (see below), whose sum is σ = 859007604. Its totient is φ = 572671728.

The previous prime is 715839647. The next prime is 715839667. The reversal of 715839665 is 566938517.

It is a happy number.

715839665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566938517 = 181 ⋅3132257.

It can be written as a sum of positive squares in 2 ways, for example, as 74787904 + 641051761 = 8648^2 + 25319^2 .

It is a cyclic number.

It is not a de Polignac number, because 715839665 - 2⁶ = 715839601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (715839667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71583962 + ... + 71583971.

It is an arithmetic number, because the mean of its divisors is an integer number (214751901).

Almost surely, 2^715839665 is an apocalyptic number.

It is an amenable number.

715839665 is a deficient number, since it is larger than the sum of its proper divisors (143167939).

715839665 is a wasteful number, since it uses less digits than its factorization.

715839665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143167938.

The product of its digits is 1360800, while the sum is 50.

The square root of 715839665 is about 26755.1801526359. The cubic root of 715839665 is about 894.5513038603.

The spelling of 715839665 in words is "seven hundred fifteen million, eight hundred thirty-nine thousand, six hundred sixty-five".