18940425463 has 2 divisors, whose sum is σ = 18940425464. Its totient is φ = 18940425462.

The previous prime is 18940425461. The next prime is 18940425487. The reversal of 18940425463 is 36452404981.

It is a weak prime.

It is an emirp because it is prime and its reverse (36452404981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18940425463 - 2¹ = 18940425461 is a prime.

Together with 18940425461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18940425461) 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, 9470212731 + 9470212732.

It is an arithmetic number, because the mean of its divisors is an integer number (9470212732).

Almost surely, 2^18940425463 is an apocalyptic number.

18940425463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18940425463 is an equidigital number, since it uses as much as digits as its factorization.

18940425463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 18940425463 in words is "eighteen billion, nine hundred forty million, four hundred twenty-five thousand, four hundred sixty-three".