12640367971 has 12 divisors (see below), whose sum is σ = 15878810416. Its totient is φ = 9849636720.

The previous prime is 12640367951. The next prime is 12640367983. The reversal of 12640367971 is 17976304621.

It is not a de Polignac number, because 12640367971 - 2⁵ = 12640367939 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12640367951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7461000 + ... + 7462693.

Almost surely, 2^12640367971 is an apocalyptic number.

12640367971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12640367971 is a deficient number, since it is larger than the sum of its proper divisors (3238442445).

12640367971 is a wasteful number, since it uses less digits than its factorization.

12640367971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14923722 (or 14923711 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 12640367971 in words is "twelve billion, six hundred forty million, three hundred sixty-seven thousand, nine hundred seventy-one".