18274821841 has 2 divisors, whose sum is σ = 18274821842. Its totient is φ = 18274821840.

The previous prime is 18274821791. The next prime is 18274821863. The reversal of 18274821841 is 14812847281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14841330625 + 3433491216 = 121825^2 + 58596^2 .

It is an emirp because it is prime and its reverse (14812847281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18274821841 - 2⁹ = 18274821329 is a prime.

It is a super-2 number, since 2×18274821841² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18274821791 and 18274821800.

It is not a weakly prime, because it can be changed into another prime (18274821871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9137410920 + 9137410921.

It is an arithmetic number, because the mean of its divisors is an integer number (9137410921).

Almost surely, 2^18274821841 is an apocalyptic number.

It is an amenable number.

18274821841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18274821841 is an equidigital number, since it uses as much as digits as its factorization.

18274821841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229376, while the sum is 46.

The spelling of 18274821841 in words is "eighteen billion, two hundred seventy-four million, eight hundred twenty-one thousand, eight hundred forty-one".