9956666599 has 32 divisors (see below), whose sum is σ = 11458713600. Its totient is φ = 8567314560.

The previous prime is 9956666593. The next prime is 9956666669.

9956666599 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-9956666599 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 (9956666593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11536842 + ... + 11537704.

It is an arithmetic number, because the mean of its divisors is an integer number (358084800).

Almost surely, 2^9956666599 is an apocalyptic number.

9956666599 is a deficient number, since it is larger than the sum of its proper divisors (1502047001).

9956666599 is a wasteful number, since it uses less digits than its factorization.

9956666599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its digits is 212576400, while the sum is 70.

The square root of 9956666599 is about 99783.0977620960. The cubic root of 9956666599 is about 2151.3182180315.

The spelling of 9956666599 in words is "nine billion, nine hundred fifty-six million, six hundred sixty-six thousand, five hundred ninety-nine".