666560655 has 24 divisors (see below), whose sum is σ = 1159041312. Its totient is φ = 354369984.

The previous prime is 666560647. The next prime is 666560693. The reversal of 666560655 is 556065666.

It is not a de Polignac number, because 666560655 - 2³ = 666560647 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 666560655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9099 + ... + 37628.

It is an arithmetic number, because the mean of its divisors is an integer number (48293388).

Almost surely, 2^666560655 is an apocalyptic number.

666560655 is a deficient number, since it is larger than the sum of its proper divisors (492480657).

666560655 is a wasteful number, since it uses less digits than its factorization.

666560655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47055 (or 47052 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The square root of 666560655 is about 25817.8359860001. The cubic root of 666560655 is about 873.5341574211.

The spelling of 666560655 in words is "six hundred sixty-six million, five hundred sixty thousand, six hundred fifty-five".