16645357 has 4 divisors (see below), whose sum is σ = 17182336. Its totient is φ = 16108380.

The previous prime is 16645337. The next prime is 16645361. The reversal of 16645357 is 75354661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75354661 = 661 ⋅114001.

It is a cyclic number.

It is not a de Polignac number, because 16645357 - 2¹¹ = 16643309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268443 + ... + 268504.

It is an arithmetic number, because the mean of its divisors is an integer number (4295584).

Almost surely, 2^16645357 is an apocalyptic number.

It is an amenable number.

16645357 is a deficient number, since it is larger than the sum of its proper divisors (536979).

16645357 is an equidigital number, since it uses as much as digits as its factorization.

16645357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536978.

The product of its digits is 75600, while the sum is 37.

The square root of 16645357 is about 4079.8721793703. The cubic root of 16645357 is about 255.3275657101.

It can be divided in two parts, 1664 and 5357, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 16645357 in words is "sixteen million, six hundred forty-five thousand, three hundred fifty-seven".