9966330591 has 16 divisors (see below), whose sum is σ = 15188279808. Its totient is φ = 5694487200.

The previous prime is 9966330587. The next prime is 9966330607. The reversal of 9966330591 is 1950336699.

It is not a de Polignac number, because 9966330591 - 2² = 9966330587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966330511) 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, 300526 + ... + 332036.

It is an arithmetic number, because the mean of its divisors is an integer number (949267488).

Almost surely, 2^9966330591 is an apocalyptic number.

9966330591 is a deficient number, since it is larger than the sum of its proper divisors (5221949217).

9966330591 is a wasteful number, since it uses less digits than its factorization.

9966330591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46582.

The product of its (nonzero) digits is 1180980, while the sum is 51.

The square root of 9966330591 is about 99831.5110123051. The cubic root of 9966330591 is about 2152.0140198198.

The spelling of 9966330591 in words is "nine billion, nine hundred sixty-six million, three hundred thirty thousand, five hundred ninety-one".