18218276491 has 6 divisors (see below), whose sum is σ = 19352979140. Its totient is φ = 17146612896.

The previous prime is 18218276467. The next prime is 18218276501. The reversal of 18218276491 is 19467281281.

It is a de Polignac number, because none of the positive numbers 2^k-18218276491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18218276411) 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 5 ways as a sum of consecutive naturals, for example, 31519221 + ... + 31519798.

Almost surely, 2^18218276491 is an apocalyptic number.

18218276491 is a deficient number, since it is larger than the sum of its proper divisors (1134702649).

18218276491 is an equidigital number, since it uses as much as digits as its factorization.

18218276491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63039053 (or 63039036 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The spelling of 18218276491 in words is "eighteen billion, two hundred eighteen million, two hundred seventy-six thousand, four hundred ninety-one".