18777644382 has 16 divisors (see below), whose sum is σ = 42920330112. Its totient is φ = 5365041240.

The previous prime is 18777644351. The next prime is 18777644393. The reversal of 18777644382 is 28344677781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223543344 + ... + 223543427.

It is an arithmetic number, because the mean of its divisors is an integer number (2682520632).

Almost surely, 2^18777644382 is an apocalyptic number.

18777644382 is an abundant number, since it is smaller than the sum of its proper divisors (24142685730).

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

18777644382 is a wasteful number, since it uses less digits than its factorization.

18777644382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447086783.

The product of its digits is 12644352, while the sum is 57.

The spelling of 18777644382 in words is "eighteen billion, seven hundred seventy-seven million, six hundred forty-four thousand, three hundred eighty-two".