681348365899776 has 144 divisors (see below), whose sum is σ = 1967908422753000. Its totient is φ = 227110437814272.

The previous prime is 681348365899769. The next prime is 681348365899777. The reversal of 681348365899776 is 677998563843186.

681348365899776 is a `hidden beast` number, since 6 + 8 + 1 + 3 + 483 + 6 + 58 + 9 + 9 + 7 + 76 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681348365899777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 770919115 + ... + 771802421.

Almost surely, 2^{681348365899776} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681348365899776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983954211376500).

681348365899776 is an abundant number, since it is smaller than the sum of its proper divisors (1286560056853224).

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

681348365899776 is a wasteful number, since it uses less digits than its factorization.

681348365899776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925184 (or 925161 counting only the distinct ones).

The product of its digits is 79009136640, while the sum is 90.

The spelling of 681348365899776 in words is "six hundred eighty-one trillion, three hundred forty-eight billion, three hundred sixty-five million, eight hundred ninety-nine thousand, seven hundred seventy-six".