861830551680 has 256 divisors, whose sum is σ = 3304764748800. Its totient is φ = 186621898752.

The previous prime is 861830551679. The next prime is 861830551693. The reversal of 861830551680 is 86155038168.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1432122 + ... + 1942841.

It is an arithmetic number, because the mean of its divisors is an integer number (12909237300).

Almost surely, 2^861830551680 is an apocalyptic number.

861830551680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

861830551680 is an abundant number, since it is smaller than the sum of its proper divisors (2442934197120).

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

861830551680 is a wasteful number, since it uses less digits than its factorization.

861830551680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375011 (or 3374999 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 861830551680 in words is "eight hundred sixty-one billion, eight hundred thirty million, five hundred fifty-one thousand, six hundred eighty".