12777777642 has 32 divisors (see below), whose sum is σ = 29269747584. Its totient is φ = 3642868800.

The previous prime is 12777777631. The next prime is 12777777671. The reversal of 12777777642 is 24677777721.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310609 + ... + 349332.

It is an arithmetic number, because the mean of its divisors is an integer number (914679612).

Almost surely, 2^12777777642 is an apocalyptic number.

12777777642 is an abundant number, since it is smaller than the sum of its proper divisors (16491969942).

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

12777777642 is a wasteful number, since it uses less digits than its factorization.

12777777642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660414.

The product of its digits is 11294304, while the sum is 57.

The spelling of 12777777642 in words is "twelve billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred forty-two".