3966565968 has 30 divisors (see below), whose sum is σ = 11100875994. Its totient is φ = 1322188608.

The previous prime is 3966565961. The next prime is 3966566011. The reversal of 3966565968 is 8695656693.

3966565968 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 565 + 9 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2427729984 + 1538835984 = 49272^2 + 39228^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966565961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13772655 + ... + 13772942.

Almost surely, 2^3966565968 is an apocalyptic number.

It is an amenable number.

3966565968 is an abundant number, since it is smaller than the sum of its proper divisors (7134310026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3966565968 is a wasteful number, since it uses less digits than its factorization.

3966565968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27545611 (or 27545602 counting only the distinct ones).

The product of its digits is 62985600, while the sum is 63.

The square root of 3966565968 is about 62980.6793231067. The cubic root of 3966565968 is about 1582.9659037144.

The spelling of 3966565968 in words is "three billion, nine hundred sixty-six million, five hundred sixty-five thousand, nine hundred sixty-eight".