681242502384 has 120 divisors (see below), whose sum is σ = 1992714680320. Its totient is φ = 225292632768.

The previous prime is 681242502323. The next prime is 681242502389. The reversal of 681242502384 is 483205242186.

681242502384 is a `hidden beast` number, since 6 + 8 + 12 + 4 + 250 + 2 + 384 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681242502389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196054 + ... + 1183605.

Almost surely, 2^681242502384 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 681242502384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996357340160).

681242502384 is an abundant number, since it is smaller than the sum of its proper divisors (1311472177936).

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

681242502384 is a wasteful number, since it uses less digits than its factorization.

681242502384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379809 (or 1379791 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 681242502384 in words is "six hundred eighty-one billion, two hundred forty-two million, five hundred two thousand, three hundred eighty-four".