12777929522 has 18 divisors (see below), whose sum is σ = 19473560253. Its totient is φ = 6288331632.

The previous prime is 12777929491. The next prime is 12777929573. The reversal of 12777929522 is 22592977721.

It can be written as a sum of positive squares in 2 ways, for example, as 12775554841 + 2374681 = 113029^2 + 1541^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=79931.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10710158 + ... + 10711350.

Almost surely, 2^12777929522 is an apocalyptic number.

12777929522 is a deficient number, since it is larger than the sum of its proper divisors (6695630731).

12777929522 is an frugal number, since it uses more digits than its factorization.

12777929522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522 (or 1262 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 53.

The spelling of 12777929522 in words is "twelve billion, seven hundred seventy-seven million, nine hundred twenty-nine thousand, five hundred twenty-two".