681517451200000 has 120 divisors (see below), whose sum is σ = 1702020834725904. Its totient is φ = 272606979840000.

The previous prime is 681517451199973. The next prime is 681517451200031. The reversal of 681517451200000 is 2154715186.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211374204 + ... + 214574203.

Almost surely, 2^{681517451200000} is an apocalyptic number.

It is an amenable number.

681517451200000 is an abundant number, since it is smaller than the sum of its proper divisors (1020503383525904).

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

681517451200000 is an frugal number, since it uses more digits than its factorization.

681517451200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425948450 (or 425948414 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 681517451200000 in words is "six hundred eighty-one trillion, five hundred seventeen billion, four hundred fifty-one million, two hundred thousand".