18443600881 has 2 divisors, whose sum is σ = 18443600882. Its totient is φ = 18443600880.

The previous prime is 18443600839. The next prime is 18443600899. The reversal of 18443600881 is 18800634481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13228450225 + 5215150656 = 115015^2 + 72216^2 .

It is an emirp because it is prime and its reverse (18800634481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18443600881 - 2⁹ = 18443600369 is a prime.

It is a super-2 number, since 2×18443600881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18443600831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221800440 + 9221800441.

It is an arithmetic number, because the mean of its divisors is an integer number (9221800441).

Almost surely, 2^18443600881 is an apocalyptic number.

It is an amenable number.

18443600881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443600881 is an equidigital number, since it uses as much as digits as its factorization.

18443600881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 43.

It can be divided in two parts, 18443600 and 881, that added together give a palindrome (18444481).

The spelling of 18443600881 in words is "eighteen billion, four hundred forty-three million, six hundred thousand, eight hundred eighty-one".