16566630 has 32 divisors (see below), whose sum is σ = 40176864. Its totient is φ = 4371456.

The previous prime is 16566611. The next prime is 16566637. The reversal of 16566630 is 3666561.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 16566591 and 16566600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (1255527).

Almost surely, 2^16566630 is an apocalyptic number.

16566630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16566630 is an abundant number, since it is smaller than the sum of its proper divisors (23610234).

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

16566630 is a wasteful number, since it uses less digits than its factorization.

16566630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 16566630 is about 4070.2125251638. The cubic root of 16566630 is about 254.9243912709.

It can be divided in two parts, 165 and 66630, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 16566630 in words is "sixteen million, five hundred sixty-six thousand, six hundred thirty".