681017280887 has 4 divisors (see below), whose sum is σ = 681019862136. Its totient is φ = 681014699640.

The previous prime is 681017280871. The next prime is 681017280947. The reversal of 681017280887 is 788082710186.

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 681017280887 - 2⁴ = 681017280871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681017280487) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 843164 + ... + 1439777.

It is an arithmetic number, because the mean of its divisors is an integer number (170254965534).

Almost surely, 2^681017280887 is an apocalyptic number.

681017280887 is a deficient number, since it is larger than the sum of its proper divisors (2581249).

681017280887 is a wasteful number, since it uses less digits than its factorization.

681017280887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581248.

The product of its (nonzero) digits is 2408448, while the sum is 56.

The spelling of 681017280887 in words is "six hundred eighty-one billion, seventeen million, two hundred eighty thousand, eight hundred eighty-seven".