12641991167 has 4 divisors (see below), whose sum is σ = 13614452040. Its totient is φ = 11669530296.

The previous prime is 12641991149. The next prime is 12641991179. The reversal of 12641991167 is 76119914621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76119914621 = 101 ⋅753662521.

It is a cyclic number.

It is not a de Polignac number, because 12641991167 - 2³² = 8347023871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641991137) 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, 486230417 + ... + 486230442.

It is an arithmetic number, because the mean of its divisors is an integer number (3403613010).

Almost surely, 2^12641991167 is an apocalyptic number.

12641991167 is a deficient number, since it is larger than the sum of its proper divisors (972460873).

12641991167 is an equidigital number, since it uses as much as digits as its factorization.

12641991167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972460872.

The product of its digits is 163296, while the sum is 47.

The spelling of 12641991167 in words is "twelve billion, six hundred forty-one million, nine hundred ninety-one thousand, one hundred sixty-seven".