666797342409 has 32 divisors (see below), whose sum is σ = 1080141283200. Its totient is φ = 403186222080.

The previous prime is 666797342369. The next prime is 666797342413. The reversal of 666797342409 is 904243797666.

It is not a de Polignac number, because 666797342409 - 2¹⁷ = 666797211337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666797342209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2463904 + ... + 2721105.

It is an arithmetic number, because the mean of its divisors is an integer number (33754415100).

Almost surely, 2^666797342409 is an apocalyptic number.

It is an amenable number.

666797342409 is a deficient number, since it is larger than the sum of its proper divisors (413343940791).

666797342409 is a wasteful number, since it uses less digits than its factorization.

666797342409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185462 (or 5185456 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 63.

The spelling of 666797342409 in words is "six hundred sixty-six billion, seven hundred ninety-seven million, three hundred forty-two thousand, four hundred nine".