18381591353 has 2 divisors, whose sum is σ = 18381591354. Its totient is φ = 18381591352.

The previous prime is 18381591341. The next prime is 18381591373. The reversal of 18381591353 is 35319518381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15633001024 + 2748590329 = 125032^2 + 52427^2 .

It is a cyclic number.

It is not a de Polignac number, because 18381591353 - 2¹⁰ = 18381590329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18381591298 and 18381591307.

It is not a weakly prime, because it can be changed into another prime (18381591323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9190795676 + 9190795677.

It is an arithmetic number, because the mean of its divisors is an integer number (9190795677).

Almost surely, 2^18381591353 is an apocalyptic number.

It is an amenable number.

18381591353 is a deficient number, since it is larger than the sum of its proper divisors (1).

18381591353 is an equidigital number, since it uses as much as digits as its factorization.

18381591353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 47.

The spelling of 18381591353 in words is "eighteen billion, three hundred eighty-one million, five hundred ninety-one thousand, three hundred fifty-three".