665926636 has 24 divisors (see below), whose sum is σ = 1217341440. Its totient is φ = 318145872.

The previous prime is 665926627. The next prime is 665926637. The reversal of 665926636 is 636629566.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 665926636.

It is not an unprimeable number, because it can be changed into a prime (665926637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96675 + ... + 103333.

It is an arithmetic number, because the mean of its divisors is an integer number (50722560).

Almost surely, 2^665926636 is an apocalyptic number.

It is an amenable number.

665926636 is a deficient number, since it is larger than the sum of its proper divisors (551414804).

665926636 is a wasteful number, since it uses less digits than its factorization.

665926636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7773 (or 7771 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 49.

The square root of 665926636 is about 25805.5543633536. The cubic root of 665926636 is about 873.2571068926.

It can be divided in two parts, 6659 and 26636, that multiplied together give a square (177369124 = 13318²).

The spelling of 665926636 in words is "six hundred sixty-five million, nine hundred twenty-six thousand, six hundred thirty-six".