666626374321 has 8 divisors (see below), whose sum is σ = 688576469504. Its totient is φ = 644704155360.

The previous prime is 666626374247. The next prime is 666626374357. The reversal of 666626374321 is 123473626666.

666626374321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666626374321 - 2²⁵ = 666592819889 is a prime.

It is a super-2 number, since 2×666626374321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666626384321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6920436 + ... + 7016101.

It is an arithmetic number, because the mean of its divisors is an integer number (86072058688).

Almost surely, 2^666626374321 is an apocalyptic number.

It is an amenable number.

666626374321 is a deficient number, since it is larger than the sum of its proper divisors (21950095183).

666626374321 is a wasteful number, since it uses less digits than its factorization.

666626374321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938111.

The product of its digits is 7838208, while the sum is 52.

The spelling of 666626374321 in words is "six hundred sixty-six billion, six hundred twenty-six million, three hundred seventy-four thousand, three hundred twenty-one".