18200019923 has 2 divisors, whose sum is σ = 18200019924. Its totient is φ = 18200019922.

The previous prime is 18200019913. The next prime is 18200019941. The reversal of 18200019923 is 32991000281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18200019923 is a prime.

It is not a weakly prime, because it can be changed into another prime (18200019913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100009961 + 9100009962.

It is an arithmetic number, because the mean of its divisors is an integer number (9100009962).

Almost surely, 2^18200019923 is an apocalyptic number.

18200019923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18200019923 is an equidigital number, since it uses as much as digits as its factorization.

18200019923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 18200019923 in words is "eighteen billion, two hundred million, nineteen thousand, nine hundred twenty-three".