18273121043 has 2 divisors, whose sum is σ = 18273121044. Its totient is φ = 18273121042.

The previous prime is 18273121003. The next prime is 18273121147. The reversal of 18273121043 is 34012137281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18273121043 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18273121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136560521 + 9136560522.

It is an arithmetic number, because the mean of its divisors is an integer number (9136560522).

Almost surely, 2^18273121043 is an apocalyptic number.

18273121043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18273121043 is an equidigital number, since it uses as much as digits as its factorization.

18273121043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 18273121043 in words is "eighteen billion, two hundred seventy-three million, one hundred twenty-one thousand, forty-three".