18550385923 has 2 divisors, whose sum is σ = 18550385924. Its totient is φ = 18550385922.

The previous prime is 18550385879. The next prime is 18550385927. The reversal of 18550385923 is 32958305581.

It is a strong prime.

It is an emirp because it is prime and its reverse (32958305581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18550385923 is a prime.

It is not a weakly prime, because it can be changed into another prime (18550385927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9275192961 + 9275192962.

It is an arithmetic number, because the mean of its divisors is an integer number (9275192962).

Almost surely, 2^18550385923 is an apocalyptic number.

18550385923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18550385923 is an equidigital number, since it uses as much as digits as its factorization.

18550385923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 18550385923 in words is "eighteen billion, five hundred fifty million, three hundred eighty-five thousand, nine hundred twenty-three".