681170197305906 has 96 divisors (see below), whose sum is σ = 1848079297584000. Its totient is φ = 176154715491840.

The previous prime is 681170197305889. The next prime is 681170197306043. The reversal of 681170197305906 is 609503791071186.

681170197305906 is a `hidden beast` number, since 6 + 8 + 1 + 1 + 7 + 0 + 1 + 9 + 7 + 30 + 590 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 47 ways as a sum of consecutive naturals, for example, 1072749831 + ... + 1073384618.

It is an arithmetic number, because the mean of its divisors is an integer number (19250826016500).

Almost surely, 2^{681170197305906} is an apocalyptic number.

681170197305906 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

681170197305906 is an abundant number, since it is smaller than the sum of its proper divisors (1166909100278094).

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

681170197305906 is a wasteful number, since it uses less digits than its factorization.

681170197305906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146134704 (or 2146134701 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 63.

The spelling of 681170197305906 in words is "six hundred eighty-one trillion, one hundred seventy billion, one hundred ninety-seven million, three hundred five thousand, nine hundred six".