681007249681 has 8 divisors (see below), whose sum is σ = 747474774624. Its totient is φ = 615299353920.

The previous prime is 681007249667. The next prime is 681007249721. The reversal of 681007249681 is 186942700186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681007249681 - 2⁵ = 681007249649 is a prime.

It is a super-2 number, since 2×681007249681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681007249621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189905416 + ... + 189909001.

It is an arithmetic number, because the mean of its divisors is an integer number (93434346828).

Almost surely, 2^681007249681 is an apocalyptic number.

It is an amenable number.

681007249681 is a deficient number, since it is larger than the sum of its proper divisors (66467524943).

681007249681 is a wasteful number, since it uses less digits than its factorization.

681007249681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379814591.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 681007249681 in words is "six hundred eighty-one billion, seven million, two hundred forty-nine thousand, six hundred eighty-one".