18391614678 has 16 divisors (see below), whose sum is σ = 40870254960. Its totient is φ = 6130538208.

The previous prime is 18391614673. The next prime is 18391614701. The reversal of 18391614678 is 87641619381.

18391614678 is a `hidden beast` number, since 18 + 3 + 9 + 1 + 614 + 6 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 340585457 = 18391614678 / (1 + 8 + 3 + 9 + 1 + 6 + 1 + 4 + 6 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18391614673) 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, 170292675 + ... + 170292782.

It is an arithmetic number, because the mean of its divisors is an integer number (2554390935).

Almost surely, 2^18391614678 is an apocalyptic number.

18391614678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18391614678 is an abundant number, since it is smaller than the sum of its proper divisors (22478640282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18391614678 is a wasteful number, since it uses less digits than its factorization.

18391614678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340585468 (or 340585462 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 18391614678 in words is "eighteen billion, three hundred ninety-one million, six hundred fourteen thousand, six hundred seventy-eight".