1684894666 has 16 divisors (see below), whose sum is σ = 3110575104. Its totient is φ = 666551664.

The previous prime is 1684894663. The next prime is 1684894669. The reversal of 1684894666 is 6664984861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1684894663) and next prime (1684894669).

It is a self number, because there is not a number n which added to its sum of digits gives 1684894666.

It is not an unprimeable number, because it can be changed into a prime (1684894661) 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 7 ways as a sum of consecutive naturals, for example, 4628650 + ... + 4629013.

It is an arithmetic number, because the mean of its divisors is an integer number (194410944).

Almost surely, 2^1684894666 is an apocalyptic number.

1684894666 is a deficient number, since it is larger than the sum of its proper divisors (1425680438).

1684894666 is a wasteful number, since it uses less digits than its factorization.

1684894666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9257685.

The product of its digits is 11943936, while the sum is 58.

The square root of 1684894666 is about 41047.4684481272. The cubic root of 1684894666 is about 1189.9377756226.

The spelling of 1684894666 in words is "one billion, six hundred eighty-four million, eight hundred ninety-four thousand, six hundred sixty-six".