16660543 has 2 divisors, whose sum is σ = 16660544. Its totient is φ = 16660542.

The previous prime is 16660537. The next prime is 16660577. The reversal of 16660543 is 34506661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16660543 - 2⁹ = 16660031 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16360543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330271 + 8330272.

It is an arithmetic number, because the mean of its divisors is an integer number (8330272).

Almost surely, 2^16660543 is an apocalyptic number.

16660543 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660543 is an equidigital number, since it uses as much as digits as its factorization.

16660543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 16660543 is about 4081.7328428010. The cubic root of 16660543 is about 255.4051894754.

The spelling of 16660543 in words is "sixteen million, six hundred sixty thousand, five hundred forty-three".