681744186264 has 192 divisors, whose sum is σ = 1929040725600. Its totient is φ = 199840542720.

The previous prime is 681744186229. The next prime is 681744186269. The reversal of 681744186264 is 462681447186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681744186269) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11340574 + ... + 11400530.

Almost surely, 2^681744186264 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 681744186264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964520362800).

681744186264 is an abundant number, since it is smaller than the sum of its proper divisors (1247296539336).

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

681744186264 is a wasteful number, since it uses less digits than its factorization.

681744186264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60074 (or 60039 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 57.

The spelling of 681744186264 in words is "six hundred eighty-one billion, seven hundred forty-four million, one hundred eighty-six thousand, two hundred sixty-four".