18198511511 has 4 divisors (see below), whose sum is σ = 18210009312. Its totient is φ = 18187013712.

The previous prime is 18198511493. The next prime is 18198511547. The reversal of 18198511511 is 11511589181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11511589181 = 1009 ⋅11408909.

It is a cyclic number.

It is not a de Polignac number, because 18198511511 - 2¹⁸ = 18198249367 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 (18198511211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5746526 + ... + 5749691.

It is an arithmetic number, because the mean of its divisors is an integer number (4552502328).

Almost surely, 2^18198511511 is an apocalyptic number.

18198511511 is a deficient number, since it is larger than the sum of its proper divisors (11497801).

18198511511 is a wasteful number, since it uses less digits than its factorization.

18198511511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11497800.

The product of its digits is 14400, while the sum is 41.

The spelling of 18198511511 in words is "eighteen billion, one hundred ninety-eight million, five hundred eleven thousand, five hundred eleven".