666620002633651 has 16 divisors (see below), whose sum is σ = 727906867712640. Its totient is φ = 605447571257280.

The previous prime is 666620002633643. The next prime is 666620002633679. The reversal of 666620002633651 is 156336200026666.

It is a cyclic number.

It is not a de Polignac number, because 666620002633651 - 2³ = 666620002633643 is a prime.

It is a super-2 number, since 2×666620002633651² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666620002633601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44963080 + ... + 57921658.

It is an arithmetic number, because the mean of its divisors is an integer number (45494179232040).

Almost surely, 2^{666620002633651} is an apocalyptic number.

666620002633651 is a deficient number, since it is larger than the sum of its proper divisors (61286865078989).

666620002633651 is a wasteful number, since it uses less digits than its factorization.

666620002633651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12962994.

The product of its (nonzero) digits is 8398080, while the sum is 52.

The spelling of 666620002633651 in words is "six hundred sixty-six trillion, six hundred twenty billion, two million, six hundred thirty-three thousand, six hundred fifty-one".