681597643882404 has 24 divisors (see below), whose sum is σ = 1602534918444768. Its totient is φ = 225464869477120.

The previous prime is 681597643882357. The next prime is 681597643882457. The reversal of 681597643882404 is 404288346795186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216793142157 + ... + 216793145300.

It is an arithmetic number, because the mean of its divisors is an integer number (66772288268532).

It is a 2-persistent number, because it is pandigital, and so is 2⋅681597643882404 = 1363195287764808, but 3⋅681597643882404 = 2044792931647212 is not.

Almost surely, 2^{681597643882404} is an apocalyptic number.

It is an amenable number.

681597643882404 is an abundant number, since it is smaller than the sum of its proper divisors (920937274562364).

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

681597643882404 is a wasteful number, since it uses less digits than its factorization.

681597643882404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433586287595 (or 433586287593 counting only the distinct ones).

The product of its (nonzero) digits is 2229534720, while the sum is 75.

The spelling of 681597643882404 in words is "six hundred eighty-one trillion, five hundred ninety-seven billion, six hundred forty-three million, eight hundred eighty-two thousand, four hundred four".