18889266658903 has 2 divisors, whose sum is σ = 18889266658904. Its totient is φ = 18889266658902.

The previous prime is 18889266658879. The next prime is 18889266658979. The reversal of 18889266658903 is 30985666298881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18889266658903 is a prime.

It is a super-2 number, since 2×18889266658903² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18889266658993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444633329451 + 9444633329452.

It is an arithmetic number, because the mean of its divisors is an integer number (9444633329452).

Almost surely, 2^{18889266658903} is an apocalyptic number.

18889266658903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889266658903 is an equidigital number, since it uses as much as digits as its factorization.

18889266658903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2149908480, while the sum is 79.

The spelling of 18889266658903 in words is "eighteen trillion, eight hundred eighty-nine billion, two hundred sixty-six million, six hundred fifty-eight thousand, nine hundred three".