1966081223 has 2 divisors, whose sum is σ = 1966081224. Its totient is φ = 1966081222.

The previous prime is 1966081219. The next prime is 1966081267. The reversal of 1966081223 is 3221806691.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1966081223 - 2² = 1966081219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966081213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983040611 + 983040612.

It is an arithmetic number, because the mean of its divisors is an integer number (983040612).

Almost surely, 2^1966081223 is an apocalyptic number.

1966081223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966081223 is an equidigital number, since it uses as much as digits as its factorization.

1966081223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1966081223 is about 44340.5144647646. The cubic root of 1966081223 is about 1252.7579049333.

The spelling of 1966081223 in words is "one billion, nine hundred sixty-six million, eighty-one thousand, two hundred twenty-three".