18216874147 has 4 divisors (see below), whose sum is σ = 18220514536. Its totient is φ = 18213233760.

The previous prime is 18216874129. The next prime is 18216874153. The reversal of 18216874147 is 74147861281.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18216874147 is a prime.

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 18216874147.

It is not an unprimeable number, because it can be changed into a prime (18216844147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1812678 + ... + 1822699.

It is an arithmetic number, because the mean of its divisors is an integer number (4555128634).

Almost surely, 2^18216874147 is an apocalyptic number.

18216874147 is a deficient number, since it is larger than the sum of its proper divisors (3640389).

18216874147 is an equidigital number, since it uses as much as digits as its factorization.

18216874147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640388.

The product of its digits is 602112, while the sum is 49.

The spelling of 18216874147 in words is "eighteen billion, two hundred sixteen million, eight hundred seventy-four thousand, one hundred forty-seven".