660605656655 has 48 divisors (see below), whose sum is σ = 938274619680. Its totient is φ = 445074739200.

The previous prime is 660605656619. The next prime is 660605656681. The reversal of 660605656655 is 556656506066.

It is not a de Polignac number, because 660605656655 - 2⁶ = 660605656591 is a prime.

It is a hoax number, since the sum of its digits (56) 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 660605656655.

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 47 ways as a sum of consecutive naturals, for example, 30069875 + ... + 30091835.

It is an arithmetic number, because the mean of its divisors is an integer number (19547387910).

Almost surely, 2^660605656655 is an apocalyptic number.

660605656655 is a deficient number, since it is larger than the sum of its proper divisors (277668963025).

660605656655 is a wasteful number, since it uses less digits than its factorization.

660605656655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24120 (or 24113 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 660605656655 in words is "six hundred sixty billion, six hundred five million, six hundred fifty-six thousand, six hundred fifty-five".