2165656 has 16 divisors (see below), whose sum is σ = 4087440. Its totient is φ = 1075680.

The previous prime is 2165651. The next prime is 2165659. The reversal of 2165656 is 6565612.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (255465).

2^2165656 is an apocalyptic number.

It is an amenable number.

2165656 is a deficient number, since it is larger than the sum of its proper divisors (1921784).

2165656 is a wasteful number, since it uses less digits than its factorization.

2165656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1790 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 2165656 is about 1471.6167979471. The cubic root of 2165656 is about 129.3788116064.

It can be divided in two parts, 21656 and 56, that added together give a palindrome (21712).

The spelling of 2165656 in words is "two million, one hundred sixty-five thousand, six hundred fifty-six".