18641395063 has 2 divisors, whose sum is σ = 18641395064. Its totient is φ = 18641395062.

The previous prime is 18641395039. The next prime is 18641395099. The reversal of 18641395063 is 36059314681.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18641395063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18641395763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320697531 + 9320697532.

It is an arithmetic number, because the mean of its divisors is an integer number (9320697532).

Almost surely, 2^18641395063 is an apocalyptic number.

18641395063 is a deficient number, since it is larger than the sum of its proper divisors (1).

18641395063 is an equidigital number, since it uses as much as digits as its factorization.

18641395063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 18641395063 in words is "eighteen billion, six hundred forty-one million, three hundred ninety-five thousand, sixty-three".