12777921629 has 16 divisors (see below), whose sum is σ = 14850017280. Its totient is φ = 10872304560.

The previous prime is 12777921613. The next prime is 12777921659. The reversal of 12777921629 is 92612977721.

It is a cyclic number.

It is not a de Polignac number, because 12777921629 - 2⁴ = 12777921613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12777921659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350957 + ... + 385650.

It is an arithmetic number, because the mean of its divisors is an integer number (928126080).

Almost surely, 2^12777921629 is an apocalyptic number.

12777921629 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12777921629 is a deficient number, since it is larger than the sum of its proper divisors (2072095651).

12777921629 is a wasteful number, since it uses less digits than its factorization.

12777921629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736720.

The product of its digits is 1333584, while the sum is 53.

The spelling of 12777921629 in words is "twelve billion, seven hundred seventy-seven million, nine hundred twenty-one thousand, six hundred twenty-nine".