18811453447 has 2 divisors, whose sum is σ = 18811453448. Its totient is φ = 18811453446.

The previous prime is 18811453433. The next prime is 18811453459. The reversal of 18811453447 is 74435411881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18811453447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18811453397 and 18811453406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18811450447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405726723 + 9405726724.

It is an arithmetic number, because the mean of its divisors is an integer number (9405726724).

Almost surely, 2^18811453447 is an apocalyptic number.

18811453447 is a deficient number, since it is larger than the sum of its proper divisors (1).

18811453447 is an equidigital number, since it uses as much as digits as its factorization.

18811453447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 46.

The spelling of 18811453447 in words is "eighteen billion, eight hundred eleven million, four hundred fifty-three thousand, four hundred forty-seven".