681854478880 has 24 divisors (see below), whose sum is σ = 1610881206732. Its totient is φ = 272741791488.

The previous prime is 681854478871. The next prime is 681854478911. The reversal of 681854478880 is 88874458186.

It can be written as a sum of positive squares in 2 ways, for example, as 681793701264 + 60777616 = 825708^2 + 7796^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130795087 + ... + 2130795406.

Almost surely, 2^681854478880 is an apocalyptic number.

It is an amenable number.

681854478880 is an abundant number, since it is smaller than the sum of its proper divisors (929026727852).

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

681854478880 is a wasteful number, since it uses less digits than its factorization.

681854478880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261590508 (or 4261590500 counting only the distinct ones).

The product of its (nonzero) digits is 110100480, while the sum is 67.

The spelling of 681854478880 in words is "six hundred eighty-one billion, eight hundred fifty-four million, four hundred seventy-eight thousand, eight hundred eighty".