18664257263 has 2 divisors, whose sum is σ = 18664257264. Its totient is φ = 18664257262.

The previous prime is 18664257223. The next prime is 18664257299. The reversal of 18664257263 is 36275246681.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (36275246681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18664257263 - 2²⁶ = 18597148399 is a prime.

It is a super-3 number, since 3×18664257263³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18664257223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332128631 + 9332128632.

It is an arithmetic number, because the mean of its divisors is an integer number (9332128632).

Almost surely, 2^18664257263 is an apocalyptic number.

18664257263 is a deficient number, since it is larger than the sum of its proper divisors (1).

18664257263 is an equidigital number, since it uses as much as digits as its factorization.

18664257263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The spelling of 18664257263 in words is "eighteen billion, six hundred sixty-four million, two hundred fifty-seven thousand, two hundred sixty-three".