66543518 has 8 divisors (see below), whose sum is σ = 99869448. Its totient is φ = 33253704.

The previous prime is 66543511. The next prime is 66543527. The reversal of 66543518 is 81534566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66543511) 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, 3821 + ... + 12152.

It is an arithmetic number, because the mean of its divisors is an integer number (12483681).

Almost surely, 2^66543518 is an apocalyptic number.

66543518 is a deficient number, since it is larger than the sum of its proper divisors (33325930).

66543518 is a wasteful number, since it uses less digits than its factorization.

66543518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18058.

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

The square root of 66543518 is about 8157.4210385391. The cubic root of 66543518 is about 405.2303074579.

The spelling of 66543518 in words is "sixty-six million, five hundred forty-three thousand, five hundred eighteen".