6643066357 has 16 divisors (see below), whose sum is σ = 6790003200. Its totient is φ = 6497884800.

The previous prime is 6643066327. The next prime is 6643066363. The reversal of 6643066357 is 7536603466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643066357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643066327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6260607 + ... + 6261667.

It is an arithmetic number, because the mean of its divisors is an integer number (424375200).

Almost surely, 2^6643066357 is an apocalyptic number.

It is an amenable number.

6643066357 is a deficient number, since it is larger than the sum of its proper divisors (146936843).

6643066357 is a wasteful number, since it uses less digits than its factorization.

6643066357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 1632960, while the sum is 46.

The square root of 6643066357 is about 81505.0081712774. The cubic root of 6643066357 is about 1879.8485577610.

The spelling of 6643066357 in words is "six billion, six hundred forty-three million, sixty-six thousand, three hundred fifty-seven".