18912678681 has 8 divisors (see below), whose sum is σ = 27156666880. Its totient is φ = 11638571472.

The previous prime is 18912678677. The next prime is 18912678709. The reversal of 18912678681 is 18687621981.

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

It is not a de Polignac number, because 18912678681 - 2² = 18912678677 is a prime.

It is a super-2 number, since 2×18912678681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18912678611) 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, 242470201 + ... + 242470278.

It is an arithmetic number, because the mean of its divisors is an integer number (3394583360).

Almost surely, 2^18912678681 is an apocalyptic number.

It is an amenable number.

18912678681 is a deficient number, since it is larger than the sum of its proper divisors (8243988199).

18912678681 is a wasteful number, since it uses less digits than its factorization.

18912678681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484940495.

The product of its digits is 2322432, while the sum is 57.

The spelling of 18912678681 in words is "eighteen billion, nine hundred twelve million, six hundred seventy-eight thousand, six hundred eighty-one".