18772254338 has 4 divisors (see below), whose sum is σ = 28158381510. Its totient is φ = 9386127168.

The previous prime is 18772254331. The next prime is 18772254341. The reversal of 18772254338 is 83345227781.

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., 9758081089 + 9014173249 = 98783^2 + 94943^2 .

It is not an unprimeable number, because it can be changed into a prime (18772254331) 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, 4693063583 + ... + 4693063586.

Almost surely, 2^18772254338 is an apocalyptic number.

18772254338 is a deficient number, since it is larger than the sum of its proper divisors (9386127172).

18772254338 is an equidigital number, since it uses as much as digits as its factorization.

18772254338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9386127171.

The product of its digits is 2257920, while the sum is 50.

The spelling of 18772254338 in words is "eighteen billion, seven hundred seventy-two million, two hundred fifty-four thousand, three hundred thirty-eight".