18948882817 has 2 divisors, whose sum is σ = 18948882818. Its totient is φ = 18948882816.

The previous prime is 18948882811. The next prime is 18948882829. The reversal of 18948882817 is 71828884981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18019303696 + 929579121 = 134236^2 + 30489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18948882817 is a prime.

It is not a weakly prime, because it can be changed into another prime (18948882811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474441408 + 9474441409.

It is an arithmetic number, because the mean of its divisors is an integer number (9474441409).

Almost surely, 2^18948882817 is an apocalyptic number.

It is an amenable number.

18948882817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948882817 is an equidigital number, since it uses as much as digits as its factorization.

18948882817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16515072, while the sum is 64.

The spelling of 18948882817 in words is "eighteen billion, nine hundred forty-eight million, eight hundred eighty-two thousand, eight hundred seventeen".