12651844971 has 4 divisors (see below), whose sum is σ = 16869126632. Its totient is φ = 8434563312.

The previous prime is 12651844967. The next prime is 12651844973. The reversal of 12651844971 is 17944815621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17944815621 = 3 ⋅5981605207.

It is not a de Polignac number, because 12651844971 - 2² = 12651844967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12651844971.

It is not an unprimeable number, because it can be changed into a prime (12651844973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108640826 + ... + 2108640831.

It is an arithmetic number, because the mean of its divisors is an integer number (4217281658).

Almost surely, 2^12651844971 is an apocalyptic number.

12651844971 is a deficient number, since it is larger than the sum of its proper divisors (4217281661).

12651844971 is an equidigital number, since it uses as much as digits as its factorization.

12651844971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217281660.

The product of its digits is 483840, while the sum is 48.

The spelling of 12651844971 in words is "twelve billion, six hundred fifty-one million, eight hundred forty-four thousand, nine hundred seventy-one".