1966223443 has 2 divisors, whose sum is σ = 1966223444. Its totient is φ = 1966223442.

The previous prime is 1966223411. The next prime is 1966223449. The reversal of 1966223443 is 3443226691.

It is a strong prime.

It is an emirp because it is prime and its reverse (3443226691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966223443 - 2⁵ = 1966223411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1966223396 and 1966223405.

It is not a weakly prime, because it can be changed into another prime (1966223449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983111721 + 983111722.

It is an arithmetic number, because the mean of its divisors is an integer number (983111722).

Almost surely, 2^1966223443 is an apocalyptic number.

1966223443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966223443 is an equidigital number, since it uses as much as digits as its factorization.

1966223443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 40.

The square root of 1966223443 is about 44342.1181609539. The cubic root of 1966223443 is about 1252.7881110325.

The spelling of 1966223443 in words is "one billion, nine hundred sixty-six million, two hundred twenty-three thousand, four hundred forty-three".