665246636 has 12 divisors (see below), whose sum is σ = 1191255912. Its totient is φ = 324887808.

The previous prime is 665246629. The next prime is 665246711. The reversal of 665246636 is 636642566.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

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, 1933685 + ... + 1934028.

It is an arithmetic number, because the mean of its divisors is an integer number (99271326).

Almost surely, 2^665246636 is an apocalyptic number.

It is an amenable number.

665246636 is a deficient number, since it is larger than the sum of its proper divisors (526009276).

665246636 is a wasteful number, since it uses less digits than its factorization.

665246636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867760 (or 3867758 counting only the distinct ones).

The product of its digits is 933120, while the sum is 44.

The square root of 665246636 is about 25792.3755400700. The cubic root of 665246636 is about 872.9597682986.

The spelling of 665246636 in words is "six hundred sixty-five million, two hundred forty-six thousand, six hundred thirty-six".