9997566 has 8 divisors (see below), whose sum is σ = 19995144. Its totient is φ = 3332520.

The previous prime is 9997523. The next prime is 9997573. The reversal of 9997566 is 6657999.

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

9997566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833125 + ... + 833136.

It is an arithmetic number, because the mean of its divisors is an integer number (2499393).

Almost surely, 2^9997566 is an apocalyptic number.

9997566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9997566 is a wasteful number, since it uses less digits than its factorization.

9997566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666266.

The product of its digits is 918540, while the sum is 51.

The square root of 9997566 is about 3161.8927875562. The cubic root of 9997566 is about 215.4259879380.

The spelling of 9997566 in words is "nine million, nine hundred ninety-seven thousand, five hundred sixty-six".