18859733891 has 2 divisors, whose sum is σ = 18859733892. Its totient is φ = 18859733890.

The previous prime is 18859733863. The next prime is 18859733897. The reversal of 18859733891 is 19833795881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18859733891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18859733897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9429866945 + 9429866946.

It is an arithmetic number, because the mean of its divisors is an integer number (9429866946).

Almost surely, 2^18859733891 is an apocalyptic number.

18859733891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18859733891 is an equidigital number, since it uses as much as digits as its factorization.

18859733891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 62.

The spelling of 18859733891 in words is "eighteen billion, eight hundred fifty-nine million, seven hundred thirty-three thousand, eight hundred ninety-one".