16660641 has 4 divisors (see below), whose sum is σ = 22214192. Its totient is φ = 11107092.

The previous prime is 16660639. The next prime is 16660681. The reversal of 16660641 is 14606661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16660641 - 2¹ = 16660639 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16660599 and 16660608.

It is not an unprimeable number, because it can be changed into a prime (16660621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776771 + ... + 2776776.

It is an arithmetic number, because the mean of its divisors is an integer number (5553548).

Almost surely, 2^16660641 is an apocalyptic number.

It is an amenable number.

16660641 is a deficient number, since it is larger than the sum of its proper divisors (5553551).

16660641 is an equidigital number, since it uses as much as digits as its factorization.

16660641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553550.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 16660641 is about 4081.7448474886. The cubic root of 16660641 is about 255.4056902526.

The spelling of 16660641 in words is "sixteen million, six hundred sixty thousand, six hundred forty-one".