9945566 has 4 divisors (see below), whose sum is σ = 14918352. Its totient is φ = 4972782.

The previous prime is 9945553. The next prime is 9945581. The reversal of 9945566 is 6655499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6655499 = 1097 ⋅6067.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2486390 + ... + 2486393.

It is an arithmetic number, because the mean of its divisors is an integer number (3729588).

Almost surely, 2^9945566 is an apocalyptic number.

9945566 is a deficient number, since it is larger than the sum of its proper divisors (4972786).

9945566 is a wasteful number, since it uses less digits than its factorization.

9945566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972785.

The product of its digits is 291600, while the sum is 44.

The square root of 9945566 is about 3153.6591445494. The cubic root of 9945566 is about 215.0518425551.

The spelling of 9945566 in words is "nine million, nine hundred forty-five thousand, five hundred sixty-six".