681240486564 has 48 divisors (see below), whose sum is σ = 1926740773440. Its totient is φ = 206436510720.

The previous prime is 681240486557. The next prime is 681240486643. The reversal of 681240486564 is 465684042186.

681240486564 is a `hidden beast` number, since 6 + 81 + 24 + 0 + 486 + 5 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 681240486564.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286716189 + ... + 286718564.

It is an arithmetic number, because the mean of its divisors is an integer number (40140432780).

Almost surely, 2^681240486564 is an apocalyptic number.

It is an amenable number.

681240486564 is an abundant number, since it is smaller than the sum of its proper divisors (1245500286876).

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

681240486564 is a wasteful number, since it uses less digits than its factorization.

681240486564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573434777 (or 573434769 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 681240486564 in words is "six hundred eighty-one billion, two hundred forty million, four hundred eighty-six thousand, five hundred sixty-four".