18612221923 has 2 divisors, whose sum is σ = 18612221924. Its totient is φ = 18612221922.

The previous prime is 18612221879. The next prime is 18612221933. The reversal of 18612221923 is 32912221681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18612221923 - 2¹³ = 18612213731 is a prime.

It is a super-2 number, since 2×18612221923² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18612221933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9306110961 + 9306110962.

It is an arithmetic number, because the mean of its divisors is an integer number (9306110962).

Almost surely, 2^18612221923 is an apocalyptic number.

18612221923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18612221923 is an equidigital number, since it uses as much as digits as its factorization.

18612221923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The spelling of 18612221923 in words is "eighteen billion, six hundred twelve million, two hundred twenty-one thousand, nine hundred twenty-three".