18533945158 has 4 divisors (see below), whose sum is σ = 27800917740. Its totient is φ = 9266972578.

The previous prime is 18533945141. The next prime is 18533945167. The reversal of 18533945158 is 85154933581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85154933581 = 59 ⋅1443303959.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4633486288 + ... + 4633486291.

It is an arithmetic number, because the mean of its divisors is an integer number (6950229435).

Almost surely, 2^18533945158 is an apocalyptic number.

18533945158 is a deficient number, since it is larger than the sum of its proper divisors (9266972582).

18533945158 is an equidigital number, since it uses as much as digits as its factorization.

18533945158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9266972581.

The product of its digits is 2592000, while the sum is 52.

The spelling of 18533945158 in words is "eighteen billion, five hundred thirty-three million, nine hundred forty-five thousand, one hundred fifty-eight".