9966655239 has 4 divisors (see below), whose sum is σ = 13288873656. Its totient is φ = 6644436824.

The previous prime is 9966655213. The next prime is 9966655249. The reversal of 9966655239 is 9325566699.

9966655239 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9966655239 - 2⁹ = 9966654727 is a prime.

It is a super-2 number, since 2×9966655239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966655249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661109204 + ... + 1661109209.

It is an arithmetic number, because the mean of its divisors is an integer number (3322218414).

Almost surely, 2^9966655239 is an apocalyptic number.

9966655239 is a deficient number, since it is larger than the sum of its proper divisors (3322218417).

9966655239 is a wasteful number, since it uses less digits than its factorization.

9966655239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322218416.

The product of its digits is 23619600, while the sum is 60.

The square root of 9966655239 is about 99833.1369786605. The cubic root of 9966655239 is about 2152.0373864760.

The spelling of 9966655239 in words is "nine billion, nine hundred sixty-six million, six hundred fifty-five thousand, two hundred thirty-nine".