66880543 has 4 divisors (see below), whose sum is σ = 66916000. Its totient is φ = 66845088.

The previous prime is 66880511. The next prime is 66880549. The reversal of 66880543 is 34508866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66880543 - 2⁵ = 66880511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66880496 and 66880505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66880549) 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, 14730 + ... + 18727.

It is an arithmetic number, because the mean of its divisors is an integer number (16729000).

Almost surely, 2^66880543 is an apocalyptic number.

66880543 is a deficient number, since it is larger than the sum of its proper divisors (35457).

66880543 is a wasteful number, since it uses less digits than its factorization.

66880543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35456.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 66880543 is about 8178.0525187847. The cubic root of 66880543 is about 405.9132831856.

The spelling of 66880543 in words is "sixty-six million, eight hundred eighty thousand, five hundred forty-three".