666471970646 has 8 divisors (see below), whose sum is σ = 1043173519344. Its totient is φ = 318747464200.

The previous prime is 666471970627. The next prime is 666471970667. The reversal of 666471970646 is 646079174666.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7244260505 + ... + 7244260596.

It is an arithmetic number, because the mean of its divisors is an integer number (130396689918).

Almost surely, 2^666471970646 is an apocalyptic number.

666471970646 is a deficient number, since it is larger than the sum of its proper divisors (376701548698).

666471970646 is a wasteful number, since it uses less digits than its factorization.

666471970646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14488521126.

The product of its (nonzero) digits is 54867456, while the sum is 62.

The spelling of 666471970646 in words is "six hundred sixty-six billion, four hundred seventy-one million, nine hundred seventy thousand, six hundred forty-six".