9985665331 has 4 divisors (see below), whose sum is σ = 9989158464. Its totient is φ = 9982172200.

The previous prime is 9985665299. The next prime is 9985665359. The reversal of 9985665331 is 1335665899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1335665899 = 21739 ⋅61441.

It is a cyclic number.

It is not a de Polignac number, because 9985665331 - 2⁵ = 9985665299 is a prime.

It is a super-2 number, since 2×9985665331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9985615331) 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, 1742275 + ... + 1747996.

It is an arithmetic number, because the mean of its divisors is an integer number (2497289616).

Almost surely, 2^9985665331 is an apocalyptic number.

9985665331 is a deficient number, since it is larger than the sum of its proper divisors (3493133).

9985665331 is a wasteful number, since it uses less digits than its factorization.

9985665331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493132.

The product of its digits is 5248800, while the sum is 55.

The square root of 9985665331 is about 99928.3009512320. The cubic root of 9985665331 is about 2153.4047608131.

The spelling of 9985665331 in words is "nine billion, nine hundred eighty-five million, six hundred sixty-five thousand, three hundred thirty-one".