681491033586 has 48 divisors (see below), whose sum is σ = 1705549760928. Its totient is φ = 194364643200.

The previous prime is 681491033581. The next prime is 681491033609. The reversal of 681491033586 is 685330194186.

681491033586 is a `hidden beast` number, since 6 + 8 + 1 + 49 + 10 + 3 + 3 + 586 = 666.

It is a super-2 number, since 2×681491033586² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681491033581) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 101228220 + ... + 101234951.

It is an arithmetic number, because the mean of its divisors is an integer number (35532286686).

Almost surely, 2^681491033586 is an apocalyptic number.

681491033586 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

681491033586 is an abundant number, since it is smaller than the sum of its proper divisors (1024058727342).

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

681491033586 is a wasteful number, since it uses less digits than its factorization.

681491033586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202463207 (or 202463204 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 681491033586 in words is "six hundred eighty-one billion, four hundred ninety-one million, thirty-three thousand, five hundred eighty-six".