666471970645 has 16 divisors (see below), whose sum is σ = 867861574272. Its totient is φ = 488406934080.

The previous prime is 666471970627. The next prime is 666471970667. The reversal of 666471970645 is 546079174666.

It is not a de Polignac number, because 666471970645 - 2⁵ = 666471970613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39126657 + ... + 39143686.

It is an arithmetic number, because the mean of its divisors is an integer number (54241348392).

Almost surely, 2^666471970645 is an apocalyptic number.

666471970645 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

666471970645 is a deficient number, since it is larger than the sum of its proper divisors (201389603627).

666471970645 is a wasteful number, since it uses less digits than its factorization.

666471970645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78270492.

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 666471970645 in words is "six hundred sixty-six billion, four hundred seventy-one million, nine hundred seventy thousand, six hundred forty-five".