12634891739 has 4 divisors (see below), whose sum is σ = 12635543760. Its totient is φ = 12634239720.

The previous prime is 12634891727. The next prime is 12634891811. The reversal of 12634891739 is 93719843621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93719843621 = 43 ⋅2179531247.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12634891739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12634891439) 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, 296024 + ... + 336005.

It is an arithmetic number, because the mean of its divisors is an integer number (3158885940).

Almost surely, 2^12634891739 is an apocalyptic number.

12634891739 is a deficient number, since it is larger than the sum of its proper divisors (652021).

12634891739 is an equidigital number, since it uses as much as digits as its factorization.

12634891739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652020.

The product of its digits is 1959552, while the sum is 53.

The spelling of 12634891739 in words is "twelve billion, six hundred thirty-four million, eight hundred ninety-one thousand, seven hundred thirty-nine".