665612536 has 16 divisors (see below), whose sum is σ = 1281754440. Its totient is φ = 323811360.

The previous prime is 665612513. The next prime is 665612537. The reversal of 665612536 is 635216566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665612537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124050 + ... + 1124641.

Almost surely, 2^665612536 is an apocalyptic number.

It is an amenable number.

665612536 is a deficient number, since it is larger than the sum of its proper divisors (616141904).

665612536 is a wasteful number, since it uses less digits than its factorization.

665612536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248734 (or 2248730 counting only the distinct ones).

The product of its digits is 194400, while the sum is 40.

The square root of 665612536 is about 25799.4677464478. The cubic root of 665612536 is about 873.1197878653.

The spelling of 665612536 in words is "six hundred sixty-five million, six hundred twelve thousand, five hundred thirty-six".