18278291443 has 2 divisors, whose sum is σ = 18278291444. Its totient is φ = 18278291442.

The previous prime is 18278291431. The next prime is 18278291497. The reversal of 18278291443 is 34419287281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18278291443 is a prime.

It is not a weakly prime, because it can be changed into another prime (18278291413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9139145721 + 9139145722.

It is an arithmetic number, because the mean of its divisors is an integer number (9139145722).

Almost surely, 2^18278291443 is an apocalyptic number.

18278291443 is a deficient number, since it is larger than the sum of its proper divisors (1).

18278291443 is an equidigital number, since it uses as much as digits as its factorization.

18278291443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 49.

The spelling of 18278291443 in words is "eighteen billion, two hundred seventy-eight million, two hundred ninety-one thousand, four hundred forty-three".