666567299328 has 288 divisors, whose sum is σ = 2119346745600. Its totient is φ = 185799720960.

The previous prime is 666567299297. The next prime is 666567299371. The reversal of 666567299328 is 823992765666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10769526 + ... + 10831242.

Almost surely, 2^666567299328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666567299328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059673372800).

666567299328 is an abundant number, since it is smaller than the sum of its proper divisors (1452779446272).

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

666567299328 is an equidigital number, since it uses as much as digits as its factorization.

666567299328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61798 (or 61770 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 69.

The spelling of 666567299328 in words is "six hundred sixty-six billion, five hundred sixty-seven million, two hundred ninety-nine thousand, three hundred twenty-eight".