18733874881 has 2 divisors, whose sum is σ = 18733874882. Its totient is φ = 18733874880.

The previous prime is 18733874843. The next prime is 18733874933. The reversal of 18733874881 is 18847833781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14269497025 + 4464377856 = 119455^2 + 66816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18733874881 is a prime.

It is a super-2 number, since 2×18733874881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18733874281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9366937440 + 9366937441.

It is an arithmetic number, because the mean of its divisors is an integer number (9366937441).

Almost surely, 2^18733874881 is an apocalyptic number.

It is an amenable number.

18733874881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18733874881 is an equidigital number, since it uses as much as digits as its factorization.

18733874881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 58.

The spelling of 18733874881 in words is "eighteen billion, seven hundred thirty-three million, eight hundred seventy-four thousand, eight hundred eighty-one".