666968000869665 has 48 divisors (see below), whose sum is σ = 1290505527305280. Its totient is φ = 315857996173440.

The previous prime is 666968000869633. The next prime is 666968000869673. The reversal of 666968000869665 is 566968000869666.

It is not a de Polignac number, because 666968000869665 - 2⁵ = 666968000869633 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15667538050 + ... + 15667580619.

It is an arithmetic number, because the mean of its divisors is an integer number (26885531818860).

Almost surely, 2^{666968000869665} is an apocalyptic number.

It is an amenable number.

666968000869665 is a deficient number, since it is larger than the sum of its proper divisors (623537526435615).

666968000869665 is a wasteful number, since it uses less digits than its factorization.

666968000869665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31335118734 (or 31335118731 counting only the distinct ones).

The product of its (nonzero) digits is 7255941120, while the sum is 81.

Subtracting from 666968000869665 its reverse (566968000869666), we obtain a palindrome (99999999999999).

The spelling of 666968000869665 in words is "six hundred sixty-six trillion, nine hundred sixty-eight billion, eight hundred sixty-nine thousand, six hundred sixty-five".