18233720146 has 4 divisors (see below), whose sum is σ = 27350580222. Its totient is φ = 9116860072.

The previous prime is 18233720117. The next prime is 18233720179. The reversal of 18233720146 is 64102733281.

It is a happy number.

18233720146 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18229050225 + 4669921 = 135015^2 + 2161^2 .

It is a super-2 number, since 2×18233720146² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4558430035 + ... + 4558430038.

Almost surely, 2^18233720146 is an apocalyptic number.

18233720146 is a deficient number, since it is larger than the sum of its proper divisors (9116860076).

18233720146 is an equidigital number, since it uses as much as digits as its factorization.

18233720146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9116860075.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 18233720146 in words is "eighteen billion, two hundred thirty-three million, seven hundred twenty thousand, one hundred forty-six".