3991674566 has 24 divisors (see below), whose sum is σ = 6645252432. Its totient is φ = 1796770800.

The previous prime is 3991674523. The next prime is 3991674569. The reversal of 3991674566 is 6654761993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991674569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55145 + ... + 104996.

It is an arithmetic number, because the mean of its divisors is an integer number (276885518).

Almost surely, 2^3991674566 is an apocalyptic number.

3991674566 is a deficient number, since it is larger than the sum of its proper divisors (2653577866).

3991674566 is a wasteful number, since it uses less digits than its factorization.

3991674566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160268 (or 160257 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 56.

The square root of 3991674566 is about 63179.7005849189. The cubic root of 3991674566 is about 1586.2989701142.

The spelling of 3991674566 in words is "three billion, nine hundred ninety-one million, six hundred seventy-four thousand, five hundred sixty-six".