16661430 has 64 divisors (see below), whose sum is σ = 46379520. Its totient is φ = 4248288.

The previous prime is 16661429. The next prime is 16661431. The reversal of 16661430 is 3416661.

It is an interprime number because it is at equal distance from previous prime (16661429) and next prime (16661431).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 16661394 and 16661403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4869 + ... + 7551.

It is an arithmetic number, because the mean of its divisors is an integer number (724680).

Almost surely, 2^16661430 is an apocalyptic number.

16661430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16661430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23189760).

16661430 is an abundant number, since it is smaller than the sum of its proper divisors (29718090).

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

16661430 is a wasteful number, since it uses less digits than its factorization.

16661430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722 (or 2716 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16661430 is about 4081.8414961877. The cubic root of 16661430 is about 255.4097219484.

The spelling of 16661430 in words is "sixteen million, six hundred sixty-one thousand, four hundred thirty".