18325193281 has 2 divisors, whose sum is σ = 18325193282. Its totient is φ = 18325193280.

The previous prime is 18325193279. The next prime is 18325193387. The reversal of 18325193281 is 18239152381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13679407681 + 4645785600 = 116959^2 + 68160^2 .

It is a cyclic number.

It is not a de Polignac number, because 18325193281 - 2¹ = 18325193279 is a prime.

It is a super-2 number, since 2×18325193281² (a number of 21 digits) contains 22 as substring.

Together with 18325193279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18325193881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9162596640 + 9162596641.

It is an arithmetic number, because the mean of its divisors is an integer number (9162596641).

Almost surely, 2^18325193281 is an apocalyptic number.

It is an amenable number.

18325193281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18325193281 is an equidigital number, since it uses as much as digits as its factorization.

18325193281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The spelling of 18325193281 in words is "eighteen billion, three hundred twenty-five million, one hundred ninety-three thousand, two hundred eighty-one".