18153869506 has 4 divisors (see below), whose sum is σ = 27230804262. Its totient is φ = 9076934752.

The previous prime is 18153869497. The next prime is 18153869527. The reversal of 18153869506 is 60596835181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60596835181 = 149 ⋅406690169.

It can be written as a sum of positive squares in only one way, i.e., 18153520225 + 349281 = 134735^2 + 591^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4538467375 + ... + 4538467378.

Almost surely, 2^18153869506 is an apocalyptic number.

18153869506 is a deficient number, since it is larger than the sum of its proper divisors (9076934756).

18153869506 is an equidigital number, since it uses as much as digits as its factorization.

18153869506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9076934755.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 18153869506 in words is "eighteen billion, one hundred fifty-three million, eight hundred sixty-nine thousand, five hundred six".