12791639454 has 64 divisors (see below), whose sum is σ = 28563736320. Its totient is φ = 3786379520.

The previous prime is 12791639449. The next prime is 12791639489. The reversal of 12791639454 is 45493619721.

It is a happy number.

It is a super-2 number, since 2×12791639454² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12791639397 and 12791639406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474424 + ... + 500660.

It is an arithmetic number, because the mean of its divisors is an integer number (446308380).

Almost surely, 2^12791639454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12791639454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14281868160).

12791639454 is an abundant number, since it is smaller than the sum of its proper divisors (15772096866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12791639454 is a wasteful number, since it uses less digits than its factorization.

12791639454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26425.

The product of its digits is 1632960, while the sum is 51.

The spelling of 12791639454 in words is "twelve billion, seven hundred ninety-one million, six hundred thirty-nine thousand, four hundred fifty-four".