16664580 has 36 divisors (see below), whose sum is σ = 50549772. Its totient is φ = 4443840.

The previous prime is 16664579. The next prime is 16664587. The reversal of 16664580 is 8546661.

It can be written as a sum of positive squares in 2 ways, for example, as 4260096 + 12404484 = 2064^2 + 3522^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16664587) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46111 + ... + 46470.

Almost surely, 2^16664580 is an apocalyptic number.

16664580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16664580 is an abundant number, since it is smaller than the sum of its proper divisors (33885192).

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

16664580 is a wasteful number, since it uses less digits than its factorization.

16664580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92596 (or 92591 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 16664580 is about 4082.2273332092. The cubic root of 16664580 is about 255.4258168039.

It can be divided in two parts, 166 and 64580, that added together give a palindrome (64746).

The spelling of 16664580 in words is "sixteen million, six hundred sixty-four thousand, five hundred eighty".