18273003481 has 2 divisors, whose sum is σ = 18273003482. Its totient is φ = 18273003480.

The previous prime is 18273003479. The next prime is 18273003491. The reversal of 18273003481 is 18430037281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15022179225 + 3250824256 = 122565^2 + 57016^2 .

It is a cyclic number.

It is not a de Polignac number, because 18273003481 - 2¹ = 18273003479 is a prime.

It is a super-2 number, since 2×18273003481² (a number of 21 digits) contains 22 as substring.

Together with 18273003479, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18273003481.

It is not a weakly prime, because it can be changed into another prime (18273003421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136501740 + 9136501741.

It is an arithmetic number, because the mean of its divisors is an integer number (9136501741).

Almost surely, 2^18273003481 is an apocalyptic number.

It is an amenable number.

18273003481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18273003481 is an equidigital number, since it uses as much as digits as its factorization.

18273003481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 18273003481 in words is "eighteen billion, two hundred seventy-three million, three thousand, four hundred eighty-one".