18478540063 has 2 divisors, whose sum is σ = 18478540064. Its totient is φ = 18478540062.

The previous prime is 18478540021. The next prime is 18478540081. The reversal of 18478540063 is 36004587481.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18478540063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18478539995 and 18478540022.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18478543063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9239270031 + 9239270032.

It is an arithmetic number, because the mean of its divisors is an integer number (9239270032).

Almost surely, 2^18478540063 is an apocalyptic number.

18478540063 is a deficient number, since it is larger than the sum of its proper divisors (1).

18478540063 is an equidigital number, since it uses as much as digits as its factorization.

18478540063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 18478540063 in words is "eighteen billion, four hundred seventy-eight million, five hundred forty thousand, sixty-three".