1668984669 has 20 divisors (see below), whose sum is σ = 2719828320. Its totient is φ = 1011505320.

The previous prime is 1668984637. The next prime is 1668984703. The reversal of 1668984669 is 9664898661.

1668984669 is a `hidden beast` number, since 166 + 8 + 9 + 8 + 466 + 9 = 666.

It is not a de Polignac number, because 1668984669 - 2⁵ = 1668984637 is a prime.

It is a super-2 number, since 2×1668984669² = 5571019650714079122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668984269) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 935689 + ... + 937470.

It is an arithmetic number, because the mean of its divisors is an integer number (135991416).

Almost surely, 2^1668984669 is an apocalyptic number.

It is an amenable number.

1668984669 is a deficient number, since it is larger than the sum of its proper divisors (1050843651).

1668984669 is a wasteful number, since it uses less digits than its factorization.

1668984669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873182 (or 1873173 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The square root of 1668984669 is about 40853.2087968620. The cubic root of 1668984669 is about 1186.1805060031.

The spelling of 1668984669 in words is "one billion, six hundred sixty-eight million, nine hundred eighty-four thousand, six hundred sixty-nine".