681854478879 has 16 divisors (see below), whose sum is σ = 1039054609152. Its totient is φ = 389616783168.

The previous prime is 681854478871. The next prime is 681854478911. The reversal of 681854478879 is 978874458186.

It is not a de Polignac number, because 681854478879 - 2³ = 681854478871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681854478879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681854478871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54 + ... + 1167779.

It is an arithmetic number, because the mean of its divisors is an integer number (64940913072).

Almost surely, 2^681854478879 is an apocalyptic number.

681854478879 is a deficient number, since it is larger than the sum of its proper divisors (357200130273).

681854478879 is a wasteful number, since it uses less digits than its factorization.

681854478879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195646.

The product of its digits is 867041280, while the sum is 75.

The spelling of 681854478879 in words is "six hundred eighty-one billion, eight hundred fifty-four million, four hundred seventy-eight thousand, eight hundred seventy-nine".