681810538020192 has 480 divisors, whose sum is σ = 2394065823012864. Its totient is φ = 186247716249600.

The previous prime is 681810538020169. The next prime is 681810538020281. The reversal of 681810538020192 is 291020835018186.

681810538020192 is a `hidden beast` number, since 6 + 8 + 1 + 8 + 10 + 538 + 0 + 2 + 0 + 1 + 92 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 39382192 + ... + 53986832.

Almost surely, 2^{681810538020192} is an apocalyptic number.

681810538020192 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 681810538020192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197032911506432).

681810538020192 is an abundant number, since it is smaller than the sum of its proper divisors (1712255284992672).

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

681810538020192 is a wasteful number, since it uses less digits than its factorization.

681810538020192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14604784 (or 14604767 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 681810538020192 in words is "six hundred eighty-one trillion, eight hundred ten billion, five hundred thirty-eight million, twenty thousand, one hundred ninety-two".