9964231985 has 8 divisors (see below), whose sum is σ = 12019033320. Its totient is φ = 7930082304.

The previous prime is 9964231943. The next prime is 9964231987. The reversal of 9964231985 is 5891324699.

It can be written as a sum of positive squares in 4 ways, for example, as 78304801 + 9885927184 = 8849^2 + 99428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9964231985 - 2⁸ = 9964231729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9964231985.

It is not an unprimeable number, because it can be changed into a prime (9964231987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5161850 + ... + 5163779.

It is an arithmetic number, because the mean of its divisors is an integer number (1502379165).

Almost surely, 2^9964231985 is an apocalyptic number.

It is an amenable number.

9964231985 is a deficient number, since it is larger than the sum of its proper divisors (2054801335).

9964231985 is a wasteful number, since it uses less digits than its factorization.

9964231985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10325827.

The product of its digits is 4199040, while the sum is 56.

The square root of 9964231985 is about 99820.9997194979. Note that the first 3 decimals coincide. The cubic root of 9964231985 is about 2151.8629596570.

Adding to 9964231985 its sum of digits (56), we get a square (9964232041 = 99821²).

The spelling of 9964231985 in words is "nine billion, nine hundred sixty-four million, two hundred thirty-one thousand, nine hundred eighty-five".