18926990912281 has 2 divisors, whose sum is σ = 18926990912282. Its totient is φ = 18926990912280.

The previous prime is 18926990912279. The next prime is 18926990912309. The reversal of 18926990912281 is 18221909962981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12741622950681 + 6185367961600 = 3569541^2 + 2487040^2 .

It is a cyclic number.

It is not a de Polignac number, because 18926990912281 - 2¹ = 18926990912279 is a prime.

It is a super-2 number, since 2×18926990912281² (a number of 27 digits) contains 22 as substring.

Together with 18926990912279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18926990912261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9463495456140 + 9463495456141.

It is an arithmetic number, because the mean of its divisors is an integer number (9463495456141).

Almost surely, 2^{18926990912281} is an apocalyptic number.

It is an amenable number.

18926990912281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18926990912281 is an equidigital number, since it uses as much as digits as its factorization.

18926990912281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 67.

The spelling of 18926990912281 in words is "eighteen trillion, nine hundred twenty-six billion, nine hundred ninety million, nine hundred twelve thousand, two hundred eighty-one".