681346680139 has 4 divisors (see below), whose sum is σ = 685919476800. Its totient is φ = 676773883480.

The previous prime is 681346680121. The next prime is 681346680149. The reversal of 681346680139 is 931086643186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681346680139 - 2⁵ = 681346680107 is a prime.

It is a super-3 number, since 3×681346680139³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681346680139.

It is not an unprimeable number, because it can be changed into a prime (681346680149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2286398107 + ... + 2286398404.

It is an arithmetic number, because the mean of its divisors is an integer number (171479869200).

Almost surely, 2^681346680139 is an apocalyptic number.

681346680139 is a deficient number, since it is larger than the sum of its proper divisors (4572796661).

681346680139 is a wasteful number, since it uses less digits than its factorization.

681346680139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572796660.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 681346680139 in words is "six hundred eighty-one billion, three hundred forty-six million, six hundred eighty thousand, one hundred thirty-nine".