665505536 has 18 divisors (see below), whose sum is σ = 1328411952. Its totient is φ = 332752640.

The previous prime is 665505523. The next prime is 665505553. The reversal of 665505536 is 635505566.

It is a junction number, because it is equal to n+sod(n) for n = 665505493 and 665505502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1299560 + ... + 1300071.

It is an arithmetic number, because the mean of its divisors is an integer number (73800664).

Almost surely, 2^665505536 is an apocalyptic number.

It is an amenable number.

665505536 is a deficient number, since it is larger than the sum of its proper divisors (662906416).

665505536 is an equidigital number, since it uses as much as digits as its factorization.

665505536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599647 (or 2599633 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 41.

The square root of 665505536 is about 25797.3939769117. The cubic root of 665505536 is about 873.0729994717.

The spelling of 665505536 in words is "six hundred sixty-five million, five hundred five thousand, five hundred thirty-six".