66543359 has 4 divisors (see below), whose sum is σ = 67385760. Its totient is φ = 65700960.

The previous prime is 66543349. The next prime is 66543397. The reversal of 66543359 is 95334566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95334566 = 2 ⋅47667283.

It is a cyclic number.

It is not a de Polignac number, because 66543359 - 2¹⁶ = 66477823 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 (66543349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421082 + ... + 421239.

It is an arithmetic number, because the mean of its divisors is an integer number (16846440).

Almost surely, 2^66543359 is an apocalyptic number.

66543359 is a deficient number, since it is larger than the sum of its proper divisors (842401).

66543359 is an equidigital number, since it uses as much as digits as its factorization.

66543359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842400.

The product of its digits is 291600, while the sum is 41.

The square root of 66543359 is about 8157.4112928061. The cubic root of 66543359 is about 405.2299847033.

The spelling of 66543359 in words is "sixty-six million, five hundred forty-three thousand, three hundred fifty-nine".