9666525021 has 32 divisors (see below), whose sum is σ = 13710643200. Its totient is φ = 6046387200.

The previous prime is 9666525017. The next prime is 9666525053. The reversal of 9666525021 is 1205256669.

9666525021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9666525021 - 2² = 9666525017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666526021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3703765 + ... + 3706373.

It is an arithmetic number, because the mean of its divisors is an integer number (428457600).

Almost surely, 2^9666525021 is an apocalyptic number.

It is an amenable number.

9666525021 is a deficient number, since it is larger than the sum of its proper divisors (4044118179).

9666525021 is a wasteful number, since it uses less digits than its factorization.

9666525021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 9666525021 is about 98318.4876867011. The cubic root of 9666525021 is about 2130.2151046842.

The spelling of 9666525021 in words is "nine billion, six hundred sixty-six million, five hundred twenty-five thousand, twenty-one".