666510656652 has 48 divisors (see below), whose sum is σ = 1728576582880. Its totient is φ = 222094877184.

The previous prime is 666510656641. The next prime is 666510656677. The reversal of 666510656652 is 256656015666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 726013 + ... + 1363860.

Almost surely, 2^666510656652 is an apocalyptic number.

It is an amenable number.

666510656652 is an abundant number, since it is smaller than the sum of its proper divisors (1062065926228).

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

666510656652 is a wasteful number, since it uses less digits than its factorization.

666510656652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092839 (or 2092831 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 54.

The spelling of 666510656652 in words is "six hundred sixty-six billion, five hundred ten million, six hundred fifty-six thousand, six hundred fifty-two".