18668288434 has 4 divisors (see below), whose sum is σ = 28002432654. Its totient is φ = 9334144216.

The previous prime is 18668288389. The next prime is 18668288437. The reversal of 18668288434 is 43488286681.

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., 17186423409 + 1481865025 = 131097^2 + 38495^2 .

It is not an unprimeable number, because it can be changed into a prime (18668288437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4667072107 + ... + 4667072110.

Almost surely, 2^18668288434 is an apocalyptic number.

18668288434 is a deficient number, since it is larger than the sum of its proper divisors (9334144220).

18668288434 is an equidigital number, since it uses as much as digits as its factorization.

18668288434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334144219.

The product of its digits is 14155776, while the sum is 58.

The spelling of 18668288434 in words is "eighteen billion, six hundred sixty-eight million, two hundred eighty-eight thousand, four hundred thirty-four".