18391893043 has 2 divisors, whose sum is σ = 18391893044. Its totient is φ = 18391893042.

The previous prime is 18391893019. The next prime is 18391893053. The reversal of 18391893043 is 34039819381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18391893043 - 2²⁹ = 17855022131 is a prime.

It is not a weakly prime, because it can be changed into another prime (18391893053) 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, 9195946521 + 9195946522.

It is an arithmetic number, because the mean of its divisors is an integer number (9195946522).

Almost surely, 2^18391893043 is an apocalyptic number.

18391893043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18391893043 is an equidigital number, since it uses as much as digits as its factorization.

18391893043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 18391893043 in words is "eighteen billion, three hundred ninety-one million, eight hundred ninety-three thousand, forty-three".