861368779482564 has 24 divisors (see below), whose sum is σ = 2016200739365568. Its totient is φ = 286217175936160.

The previous prime is 861368779482557. The next prime is 861368779482667. The reversal of 861368779482564 is 465284977863168.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113218815792 + ... + 113218823399.

It is an arithmetic number, because the mean of its divisors is an integer number (84008364140232).

Almost surely, 2^{861368779482564} is an apocalyptic number.

It is an amenable number.

861368779482564 is an abundant number, since it is smaller than the sum of its proper divisors (1154831959883004).

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

861368779482564 is a wasteful number, since it uses less digits than its factorization.

861368779482564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226437639515 (or 226437639513 counting only the distinct ones).

The product of its digits is 23410114560, while the sum is 84.

The spelling of 861368779482564 in words is "eight hundred sixty-one trillion, three hundred sixty-eight billion, seven hundred seventy-nine million, four hundred eighty-two thousand, five hundred sixty-four".