18393019998923 has 2 divisors, whose sum is σ = 18393019998924. Its totient is φ = 18393019998922.

The previous prime is 18393019998817. The next prime is 18393019999099. The reversal of 18393019998923 is 32989991039381.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18393019998923 is a prime.

It is not a weakly prime, because it can be changed into another prime (18393019998623) 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, 9196509999461 + 9196509999462.

It is an arithmetic number, because the mean of its divisors is an integer number (9196509999462).

Almost surely, 2^{18393019998923} is an apocalyptic number.

18393019998923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18393019998923 is an equidigital number, since it uses as much as digits as its factorization.

18393019998923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204073344, while the sum is 74.

The spelling of 18393019998923 in words is "eighteen trillion, three hundred ninety-three billion, nineteen million, nine hundred ninety-eight thousand, nine hundred twenty-three".