84194789666 has 16 divisors (see below), whose sum is σ = 136490990328. Its totient is φ = 38720841600.

The previous prime is 84194789663. The next prime is 84194789671. The reversal of 84194789666 is 66698749148.

It can be written as a sum of positive squares in 4 ways, for example, as 52725803641 + 31468986025 = 229621^2 + 177395^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84194789596 and 84194789605.

It is not an unprimeable number, because it can be changed into a prime (84194789663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5754725 + ... + 5769336.

Almost surely, 2^84194789666 is an apocalyptic number.

84194789666 is a deficient number, since it is larger than the sum of its proper divisors (52296200662).

84194789666 is a wasteful number, since it uses less digits than its factorization.

84194789666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524357.

The product of its digits is 125411328, while the sum is 68.

The spelling of 84194789666 in words is "eighty-four billion, one hundred ninety-four million, seven hundred eighty-nine thousand, six hundred sixty-six".