18923686543 has 2 divisors, whose sum is σ = 18923686544. Its totient is φ = 18923686542.

The previous prime is 18923686487. The next prime is 18923686549. The reversal of 18923686543 is 34568632981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18923686543 - 2¹⁷ = 18923555471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18923686549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461843271 + 9461843272.

It is an arithmetic number, because the mean of its divisors is an integer number (9461843272).

Almost surely, 2^18923686543 is an apocalyptic number.

18923686543 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923686543 is an equidigital number, since it uses as much as digits as its factorization.

18923686543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 55.

The spelling of 18923686543 in words is "eighteen billion, nine hundred twenty-three million, six hundred eighty-six thousand, five hundred forty-three".