66518543 has 8 divisors (see below), whose sum is σ = 81869088. Its totient is φ = 52629984.

The previous prime is 66518537. The next prime is 66518579. The reversal of 66518543 is 34581566.

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 66518543 - 2⁴ = 66518527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66518497 and 66518506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66518513) 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 7 ways as a sum of consecutive naturals, for example, 365396 + ... + 365577.

It is an arithmetic number, because the mean of its divisors is an integer number (10233636).

Almost surely, 2^66518543 is an apocalyptic number.

66518543 is a deficient number, since it is larger than the sum of its proper divisors (15350545).

66518543 is a wasteful number, since it uses less digits than its factorization.

66518543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730993.

The product of its digits is 86400, while the sum is 38.

The square root of 66518543 is about 8155.8900801813. The cubic root of 66518543 is about 405.1796043308.

The spelling of 66518543 in words is "sixty-six million, five hundred eighteen thousand, five hundred forty-three".