1966814866 has 8 divisors (see below), whose sum is σ = 2956794300. Its totient is φ = 981216768.

The previous prime is 1966814851. The next prime is 1966814869. The reversal of 1966814866 is 6684186691.

It can be written as a sum of positive squares in 2 ways, for example, as 1807525225 + 159289641 = 42515^2 + 12621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1966814869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094211 + ... + 1096006.

Almost surely, 2^1966814866 is an apocalyptic number.

1966814866 is a deficient number, since it is larger than the sum of its proper divisors (989979434).

1966814866 is a wasteful number, since it uses less digits than its factorization.

1966814866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190668.

The product of its digits is 2985984, while the sum is 55.

The square root of 1966814866 is about 44348.7865222939. The cubic root of 1966814866 is about 1252.9137077154.

The spelling of 1966814866 in words is "one billion, nine hundred sixty-six million, eight hundred fourteen thousand, eight hundred sixty-six".