9956566 has 4 divisors (see below), whose sum is σ = 14934852. Its totient is φ = 4978282.

The previous prime is 9956561. The next prime is 9956579. The reversal of 9956566 is 6656599.

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: 6656599 = 31 ⋅214729.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9956561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489140 + ... + 2489143.

It is an arithmetic number, because the mean of its divisors is an integer number (3733713).

Almost surely, 2^9956566 is an apocalyptic number.

9956566 is a deficient number, since it is larger than the sum of its proper divisors (4978286).

9956566 is a wasteful number, since it uses less digits than its factorization.

9956566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978285.

The product of its digits is 437400, while the sum is 46.

The square root of 9956566 is about 3155.4026684403. The cubic root of 9956566 is about 215.1310972595.

It can be divided in two parts, 99 and 56566, that added together give a palindrome (56665).

The spelling of 9956566 in words is "nine million, nine hundred fifty-six thousand, five hundred sixty-six".