12641686741 has 4 divisors (see below), whose sum is σ = 12717385632. Its totient is φ = 12565987852.

The previous prime is 12641686721. The next prime is 12641686747. The reversal of 12641686741 is 14768614621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14768614621 = 47 ⋅314225843.

It is a cyclic number.

It is not a de Polignac number, because 12641686741 - 2⁵ = 12641686709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12641686691 and 12641686700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641686747) 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, 37849195 + ... + 37849528.

It is an arithmetic number, because the mean of its divisors is an integer number (3179346408).

Almost surely, 2^12641686741 is an apocalyptic number.

It is an amenable number.

12641686741 is a deficient number, since it is larger than the sum of its proper divisors (75698891).

12641686741 is an equidigital number, since it uses as much as digits as its factorization.

12641686741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75698890.

The product of its digits is 387072, while the sum is 46.

The spelling of 12641686741 in words is "twelve billion, six hundred forty-one million, six hundred eighty-six thousand, seven hundred forty-one".