18924219117 has 12 divisors (see below), whose sum is σ = 27970681024. Its totient is φ = 12322747080.

The previous prime is 18924219113. The next prime is 18924219121. The reversal of 18924219117 is 71191242981.

It is an interprime number because it is at equal distance from previous prime (18924219113) and next prime (18924219121).

It is not a de Polignac number, because 18924219117 - 2² = 18924219113 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 (18924219113) 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, 24449509 + ... + 24450282.

Almost surely, 2^18924219117 is an apocalyptic number.

It is an amenable number.

18924219117 is a deficient number, since it is larger than the sum of its proper divisors (9046461907).

18924219117 is a wasteful number, since it uses less digits than its factorization.

18924219117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48899840 (or 48899837 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The spelling of 18924219117 in words is "eighteen billion, nine hundred twenty-four million, two hundred nineteen thousand, one hundred seventeen".