18940425487 has 2 divisors, whose sum is σ = 18940425488. Its totient is φ = 18940425486.

The previous prime is 18940425463. The next prime is 18940425523. The reversal of 18940425487 is 78452404981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18940425487 - 2¹⁵ = 18940392719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18940425437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470212743 + 9470212744.

It is an arithmetic number, because the mean of its divisors is an integer number (9470212744).

Almost surely, 2^18940425487 is an apocalyptic number.

18940425487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18940425487 is an equidigital number, since it uses as much as digits as its factorization.

18940425487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 18940425487 in words is "eighteen billion, nine hundred forty million, four hundred twenty-five thousand, four hundred eighty-seven".