681334719912 has 896 divisors, whose sum is σ = 2610944409600. Its totient is φ = 161131161600.

The previous prime is 681334719907. The next prime is 681334719917. The reversal of 681334719912 is 219917433186.

681334719912 is a `hidden beast` number, since 6 + 81 + 3 + 3 + 471 + 9 + 91 + 2 = 666.

681334719912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (681334719907) and next prime (681334719917).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (681334719917) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 236655289 + ... + 236658167.

Almost surely, 2^681334719912 is an apocalyptic number.

681334719912 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681334719912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305472204800).

681334719912 is an abundant number, since it is smaller than the sum of its proper divisors (1929609689688).

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

681334719912 is a wasteful number, since it uses less digits than its factorization.

681334719912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969 (or 2950 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 681334719912 in words is "six hundred eighty-one billion, three hundred thirty-four million, seven hundred nineteen thousand, nine hundred twelve".