16661560 has 32 divisors (see below), whose sum is σ = 38054160. Its totient is φ = 6564096.

The previous prime is 16661531. The next prime is 16661563. The reversal of 16661560 is 6516661.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661563) 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, 429 + ... + 5788.

Almost surely, 2^16661560 is an apocalyptic number.

16661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16661560 is an abundant number, since it is smaller than the sum of its proper divisors (21392600).

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

16661560 is a wasteful number, since it uses less digits than its factorization.

16661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6295 (or 6291 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 16661560 is about 4081.8574203419. The cubic root of 16661560 is about 255.4103862207.

It can be divided in two parts, 1 and 6661560, that added together give a square (6661561 = 2581²).

The spelling of 16661560 in words is "sixteen million, six hundred sixty-one thousand, five hundred sixty".