18355436423 has 2 divisors, whose sum is σ = 18355436424. Its totient is φ = 18355436422.

The previous prime is 18355436389. The next prime is 18355436441. The reversal of 18355436423 is 32463455381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18355436423 - 2¹² = 18355432327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18355436023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177718211 + 9177718212.

It is an arithmetic number, because the mean of its divisors is an integer number (9177718212).

Almost surely, 2^18355436423 is an apocalyptic number.

18355436423 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355436423 is an equidigital number, since it uses as much as digits as its factorization.

18355436423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 44.

The spelling of 18355436423 in words is "eighteen billion, three hundred fifty-five million, four hundred thirty-six thousand, four hundred twenty-three".