665375686 has 8 divisors (see below), whose sum is σ = 1014980040. Its totient is φ = 327049008.

The previous prime is 665375651. The next prime is 665375707. The reversal of 665375686 is 686573566.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819271 + ... + 2819506.

It is an arithmetic number, because the mean of its divisors is an integer number (126872505).

Almost surely, 2^665375686 is an apocalyptic number.

665375686 is a deficient number, since it is larger than the sum of its proper divisors (349604354).

665375686 is a wasteful number, since it uses less digits than its factorization.

665375686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5638838.

The product of its digits is 5443200, while the sum is 52.

The square root of 665375686 is about 25794.8771270576. The cubic root of 665375686 is about 873.0162126147.

The spelling of 665375686 in words is "six hundred sixty-five million, three hundred seventy-five thousand, six hundred eighty-six".