3982405666 has 8 divisors (see below), whose sum is σ = 5973889644. Its totient is φ = 1991109120.

The previous prime is 3982405649. The next prime is 3982405667. The reversal of 3982405666 is 6665042893.

3982405666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3098592225 + 883813441 = 55665^2 + 29729^2 .

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 (3982405667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34546 + ... + 95698.

Almost surely, 2^3982405666 is an apocalyptic number.

3982405666 is a deficient number, since it is larger than the sum of its proper divisors (1991483978).

3982405666 is a wasteful number, since it uses less digits than its factorization.

3982405666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93716.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The square root of 3982405666 is about 63106.3044869528. The cubic root of 3982405666 is about 1585.0701924352.

The spelling of 3982405666 in words is "three billion, nine hundred eighty-two million, four hundred five thousand, six hundred sixty-six".