18226616391 has 12 divisors (see below), whose sum is σ = 26328569800. Its totient is φ = 12150507600.

The previous prime is 18226616389. The next prime is 18226616393. The reversal of 18226616391 is 19361662281.

18226616391 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 6 + 6 + 1 + 639 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (18226616389) and next prime (18226616393).

It is not a de Polignac number, because 18226616391 - 2¹ = 18226616389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18226616393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259341 + ... + 322041.

Almost surely, 2^18226616391 is an apocalyptic number.

18226616391 is a deficient number, since it is larger than the sum of its proper divisors (8101953409).

18226616391 is a wasteful number, since it uses less digits than its factorization.

18226616391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95006 (or 95003 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 18226616391 in words is "eighteen billion, two hundred twenty-six million, six hundred sixteen thousand, three hundred ninety-one".