12971766685 has 4 divisors (see below), whose sum is σ = 15566120028. Its totient is φ = 10377413344.

The previous prime is 12971766679. The next prime is 12971766737. The reversal of 12971766685 is 58666717921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7020261369 + 5951505316 = 83787^2 + 77146^2 .

It is a cyclic number.

It is not a de Polignac number, because 12971766685 - 2⁵ = 12971766653 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 3 ways as a sum of consecutive naturals, for example, 1297176664 + ... + 1297176673.

It is an arithmetic number, because the mean of its divisors is an integer number (3891530007).

Almost surely, 2^12971766685 is an apocalyptic number.

It is an amenable number.

12971766685 is a deficient number, since it is larger than the sum of its proper divisors (2594353343).

12971766685 is an equidigital number, since it uses as much as digits as its factorization.

12971766685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594353342.

The product of its digits is 7620480, while the sum is 58.

The spelling of 12971766685 in words is "twelve billion, nine hundred seventy-one million, seven hundred sixty-six thousand, six hundred eighty-five".