681681876159 has 8 divisors (see below), whose sum is σ = 909070031232. Its totient is φ = 454374152600.

The previous prime is 681681876149. The next prime is 681681876193. The reversal of 681681876159 is 951678186186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681681876159 - 2⁹ = 681681875647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681681876159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681681876149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20088099 + ... + 20122004.

It is an arithmetic number, because the mean of its divisors is an integer number (113633753904).

Almost surely, 2^681681876159 is an apocalyptic number.

681681876159 is a deficient number, since it is larger than the sum of its proper divisors (227388155073).

681681876159 is a wasteful number, since it uses less digits than its factorization.

681681876159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40215757.

The product of its digits is 34836480, while the sum is 66.

The spelling of 681681876159 in words is "six hundred eighty-one billion, six hundred eighty-one million, eight hundred seventy-six thousand, one hundred fifty-nine".