665432928636 has 24 divisors (see below), whose sum is σ = 1774487809920. Its totient is φ = 190123693872.

The previous prime is 665432928617. The next prime is 665432928647. The reversal of 665432928636 is 636829234566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 665432928636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3960910206 + ... + 3960910373.

It is an arithmetic number, because the mean of its divisors is an integer number (73936992080).

Almost surely, 2^665432928636 is an apocalyptic number.

It is an amenable number.

665432928636 is an abundant number, since it is smaller than the sum of its proper divisors (1109054881284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665432928636 is a wasteful number, since it uses less digits than its factorization.

665432928636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921820593 (or 7921820591 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 60.

The spelling of 665432928636 in words is "six hundred sixty-five billion, four hundred thirty-two million, nine hundred twenty-eight thousand, six hundred thirty-six".