16505656 has 16 divisors (see below), whose sum is σ = 30992040. Its totient is φ = 8241120.

The previous prime is 16505653. The next prime is 16505677. The reversal of 16505656 is 65650561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505653) 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, 8575 + ... + 10321.

Almost surely, 2^16505656 is an apocalyptic number.

It is an amenable number.

16505656 is a deficient number, since it is larger than the sum of its proper divisors (14486384).

16505656 is a wasteful number, since it uses less digits than its factorization.

16505656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934 (or 2930 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 16505656 is about 4062.7153481385. The cubic root of 16505656 is about 254.6112543870.

It can be divided in two parts, 16505 and 656, that added together give a square (17161 = 131²).

The spelling of 16505656 in words is "sixteen million, five hundred five thousand, six hundred fifty-six".