715866665 has 8 divisors (see below), whose sum is σ = 860255880. Its totient is φ = 571882752.

The previous prime is 715866649. The next prime is 715866673. The reversal of 715866665 is 566668517.

It can be written as a sum of positive squares in 4 ways, for example, as 59892121 + 655974544 = 7739^2 + 25612^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 715866665 - 2⁴ = 715866649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97424 + ... + 104513.

It is an arithmetic number, because the mean of its divisors is an integer number (107531985).

Almost surely, 2^715866665 is an apocalyptic number.

It is an amenable number.

715866665 is a deficient number, since it is larger than the sum of its proper divisors (144389215).

715866665 is a wasteful number, since it uses less digits than its factorization.

715866665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202651.

The product of its digits is 1814400, while the sum is 50.

The square root of 715866665 is about 26755.6847230640. The cubic root of 715866665 is about 894.5625505974.

The spelling of 715866665 in words is "seven hundred fifteen million, eight hundred sixty-six thousand, six hundred sixty-five".