18251649263 has 2 divisors, whose sum is σ = 18251649264. Its totient is φ = 18251649262.

The previous prime is 18251649239. The next prime is 18251649281. The reversal of 18251649263 is 36294615281.

It is a strong prime.

It is an emirp because it is prime and its reverse (36294615281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18251649263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18251649203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9125824631 + 9125824632.

It is an arithmetic number, because the mean of its divisors is an integer number (9125824632).

Almost surely, 2^18251649263 is an apocalyptic number.

18251649263 is a deficient number, since it is larger than the sum of its proper divisors (1).

18251649263 is an equidigital number, since it uses as much as digits as its factorization.

18251649263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 47.

The spelling of 18251649263 in words is "eighteen billion, two hundred fifty-one million, six hundred forty-nine thousand, two hundred sixty-three".