681783031764 has 144 divisors (see below), whose sum is σ = 1817653219200. Its totient is φ = 215143149312.

The previous prime is 681783031763. The next prime is 681783031771. The reversal of 681783031764 is 467130387186.

It is a super-2 number, since 2×681783031764² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681783031764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681783031763) 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, 112818927 + ... + 112824969.

It is an arithmetic number, because the mean of its divisors is an integer number (12622591800).

Almost surely, 2^681783031764 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 681783031764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908826609600).

681783031764 is an abundant number, since it is smaller than the sum of its proper divisors (1135870187436).

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

681783031764 is a wasteful number, since it uses less digits than its factorization.

681783031764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8174 (or 8169 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 681783031764 in words is "six hundred eighty-one billion, seven hundred eighty-three million, thirty-one thousand, seven hundred sixty-four".