18388435346 has 4 divisors (see below), whose sum is σ = 27582653022. Its totient is φ = 9194217672.

The previous prime is 18388435319. The next prime is 18388435349. The reversal of 18388435346 is 64353488381.

It is a happy number.

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., 17464944025 + 923491321 = 132155^2 + 30389^2 .

It is not an unprimeable number, because it can be changed into a prime (18388435349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4597108835 + ... + 4597108838.

Almost surely, 2^18388435346 is an apocalyptic number.

18388435346 is a deficient number, since it is larger than the sum of its proper divisors (9194217676).

18388435346 is an equidigital number, since it uses as much as digits as its factorization.

18388435346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194217675.

The product of its digits is 6635520, while the sum is 53.

The spelling of 18388435346 in words is "eighteen billion, three hundred eighty-eight million, four hundred thirty-five thousand, three hundred forty-six".