16641257 has 8 divisors (see below), whose sum is σ = 16868352. Its totient is φ = 16416000.

The previous prime is 16641239. The next prime is 16641263. The reversal of 16641257 is 75214661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16641257 - 2¹⁰ = 16640233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16641217) 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 7 ways as a sum of consecutive naturals, for example, 28553 + ... + 29129.

It is an arithmetic number, because the mean of its divisors is an integer number (2108544).

Almost surely, 2^16641257 is an apocalyptic number.

It is an amenable number.

16641257 is a deficient number, since it is larger than the sum of its proper divisors (227095).

16641257 is a wasteful number, since it uses less digits than its factorization.

16641257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919.

The product of its digits is 10080, while the sum is 32.

The square root of 16641257 is about 4079.3696817033. The cubic root of 16641257 is about 255.3066003245.

The spelling of 16641257 in words is "sixteen million, six hundred forty-one thousand, two hundred fifty-seven".