9981966571 has 8 divisors (see below), whose sum is σ = 10029215264. Its totient is φ = 9934816320.

The previous prime is 9981966569. The next prime is 9981966587. The reversal of 9981966571 is 1756691899.

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 9981966571 - 2¹ = 9981966569 is a prime.

It is a super-2 number, since 2×9981966571² (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 (9981966871) 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 7 ways as a sum of consecutive naturals, for example, 182770 + ... + 231016.

It is an arithmetic number, because the mean of its divisors is an integer number (1253651908).

Almost surely, 2^9981966571 is an apocalyptic number.

9981966571 is a deficient number, since it is larger than the sum of its proper divisors (47248693).

9981966571 is a wasteful number, since it uses less digits than its factorization.

9981966571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49221.

The product of its digits is 7348320, while the sum is 61.

The square root of 9981966571 is about 99909.7921677350. The cubic root of 9981966571 is about 2153.1388492704.

The spelling of 9981966571 in words is "nine billion, nine hundred eighty-one million, nine hundred sixty-six thousand, five hundred seventy-one".