681424253972 has 144 divisors (see below), whose sum is σ = 1585302969600. Its totient is φ = 253088559360.

The previous prime is 681424253963. The next prime is 681424253987. The reversal of 681424253972 is 279352424186.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4870418 + ... + 5008374.

It is an arithmetic number, because the mean of its divisors is an integer number (11009048400).

Almost surely, 2^681424253972 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 681424253972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792651484800).

681424253972 is an abundant number, since it is smaller than the sum of its proper divisors (903878715628).

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

681424253972 is a wasteful number, since it uses less digits than its factorization.

681424253972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138094 (or 138085 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The spelling of 681424253972 in words is "six hundred eighty-one billion, four hundred twenty-four million, two hundred fifty-three thousand, nine hundred seventy-two".