18956548519 has 4 divisors (see below), whose sum is σ = 18989864640. Its totient is φ = 18923232400.

The previous prime is 18956548483. The next prime is 18956548529. The reversal of 18956548519 is 91584565981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91584565981 = 101 ⋅906777881.

It is a cyclic number.

It is not a de Polignac number, because 18956548519 - 2²³ = 18948159911 is a prime.

It is a super-2 number, since 2×18956548519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18956548529) 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, 16657207 + ... + 16658344.

It is an arithmetic number, because the mean of its divisors is an integer number (4747466160).

Almost surely, 2^18956548519 is an apocalyptic number.

18956548519 is a deficient number, since it is larger than the sum of its proper divisors (33316121).

18956548519 is an equidigital number, since it uses as much as digits as its factorization.

18956548519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33316120.

The product of its digits is 15552000, while the sum is 61.

The spelling of 18956548519 in words is "eighteen billion, nine hundred fifty-six million, five hundred forty-eight thousand, five hundred nineteen".