971666868625 has 16 divisors (see below), whose sum is σ = 1283972034384. Its totient is φ = 731607993600.

The previous prime is 971666868607. The next prime is 971666868713. The reversal of 971666868625 is 526868666179.

It can be written as a sum of positive squares in 8 ways, for example, as 19356322129 + 952310546496 = 139127^2 + 975864^2 .

It is not a de Polignac number, because 971666868625 - 2⁹ = 971666868113 is a prime.

It is a Duffinian 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, 228625374 + ... + 228629623.

It is an arithmetic number, because the mean of its divisors is an integer number (80248252149).

Almost surely, 2^971666868625 is an apocalyptic number.

It is an amenable number.

971666868625 is a deficient number, since it is larger than the sum of its proper divisors (312305165759).

971666868625 is a wasteful number, since it uses less digits than its factorization.

971666868625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457255029 (or 457255019 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 70.

The spelling of 971666868625 in words is "nine hundred seventy-one billion, six hundred sixty-six million, eight hundred sixty-eight thousand, six hundred twenty-five".