3960297666 has 144 divisors (see below), whose sum is σ = 9636491592. Its totient is φ = 1174118400.

The previous prime is 3960297659. The next prime is 3960297683. The reversal of 3960297666 is 6667920693.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 965034225 + 2995263441 = 31065^2 + 54729^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14093446 + ... + 14093726.

Almost surely, 2^3960297666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3960297666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4818245796).

3960297666 is an abundant number, since it is smaller than the sum of its proper divisors (5676193926).

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

3960297666 is a wasteful number, since it uses less digits than its factorization.

3960297666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The square root of 3960297666 is about 62930.8959573912. The cubic root of 3960297666 is about 1582.1316186923.

The spelling of 3960297666 in words is "three billion, nine hundred sixty million, two hundred ninety-seven thousand, six hundred sixty-six".