3966639999 has 32 divisors (see below), whose sum is σ = 6327336960. Its totient is φ = 2162613600.

The previous prime is 3966639979. The next prime is 3966640001. The reversal of 3966639999 is 9999366693.

It is not a de Polignac number, because 3966639999 - 2¹³ = 3966631807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966639979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3312 + ... + 89130.

It is an arithmetic number, because the mean of its divisors is an integer number (197729280).

Almost surely, 2^3966639999 is an apocalyptic number.

3966639999 is a deficient number, since it is larger than the sum of its proper divisors (2360696961).

3966639999 is a wasteful number, since it uses less digits than its factorization.

3966639999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85931.

The product of its digits is 114791256, while the sum is 69.

The square root of 3966639999 is about 62981.2670482263. The cubic root of 3966639999 is about 1582.9757516804.

The spelling of 3966639999 in words is "three billion, nine hundred sixty-six million, six hundred thirty-nine thousand, nine hundred ninety-nine".