66543772 has 12 divisors (see below), whose sum is σ = 117167176. Its totient is φ = 33067440.

The previous prime is 66543751. The next prime is 66543781. The reversal of 66543772 is 27734566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50379 + ... + 51682.

Almost surely, 2^66543772 is an apocalyptic number.

It is an amenable number.

66543772 is a deficient number, since it is larger than the sum of its proper divisors (50623404).

66543772 is a wasteful number, since it uses less digits than its factorization.

66543772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102228 (or 102226 counting only the distinct ones).

The product of its digits is 211680, while the sum is 40.

The square root of 66543772 is about 8157.4366071702. The cubic root of 66543772 is about 405.2308230521.

The spelling of 66543772 in words is "sixty-six million, five hundred forty-three thousand, seven hundred seventy-two".