18893155861 has 2 divisors, whose sum is σ = 18893155862. Its totient is φ = 18893155860.

The previous prime is 18893155847. The next prime is 18893155873. The reversal of 18893155861 is 16855139881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12120688836 + 6772467025 = 110094^2 + 82295^2 .

It is a cyclic number.

It is not a de Polignac number, because 18893155861 - 2⁵ = 18893155829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18893155261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9446577930 + 9446577931.

It is an arithmetic number, because the mean of its divisors is an integer number (9446577931).

Almost surely, 2^18893155861 is an apocalyptic number.

It is an amenable number.

18893155861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18893155861 is an equidigital number, since it uses as much as digits as its factorization.

18893155861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 55.

The spelling of 18893155861 in words is "eighteen billion, eight hundred ninety-three million, one hundred fifty-five thousand, eight hundred sixty-one".