8166656 has 72 divisors (see below), whose sum is σ = 18150720. Its totient is φ = 3649536.

The previous prime is 8166649. The next prime is 8166659. The reversal of 8166656 is 6566618.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8166659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111836 + ... + 111908.

Almost surely, 2^8166656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8166656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9075360).

8166656 is an abundant number, since it is smaller than the sum of its proper divisors (9984064).

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

8166656 is a wasteful number, since it uses less digits than its factorization.

8166656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 117 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 8166656 is about 2857.7361669685. The cubic root of 8166656 is about 201.3792662573.

Subtracting from 8166656 its sum of digits (38), we obtain a palindrome (8166618).

The spelling of 8166656 in words is "eight million, one hundred sixty-six thousand, six hundred fifty-six".