12638765123 has 8 divisors (see below), whose sum is σ = 13162338000. Its totient is φ = 12121042528.

The previous prime is 12638765119. The next prime is 12638765143. The reversal of 12638765123 is 32156783621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12638765123 - 2² = 12638765119 is a prime.

It is a super-2 number, since 2×12638765123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12638765143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1458161 + ... + 1466802.

It is an arithmetic number, because the mean of its divisors is an integer number (1645292250).

Almost surely, 2^12638765123 is an apocalyptic number.

12638765123 is a deficient number, since it is larger than the sum of its proper divisors (523572877).

12638765123 is a wasteful number, since it uses less digits than its factorization.

12638765123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925141.

The product of its digits is 362880, while the sum is 44.

The spelling of 12638765123 in words is "twelve billion, six hundred thirty-eight million, seven hundred sixty-five thousand, one hundred twenty-three".