66549823755 has 16 divisors (see below), whose sum is σ = 112743231264. Its totient is φ = 33405401600.

The previous prime is 66549823751. The next prime is 66549823763. The reversal of 66549823755 is 55732894566.

It is not a de Polignac number, because 66549823755 - 2² = 66549823751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66549823751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130489596 + ... + 130490105.

It is an arithmetic number, because the mean of its divisors is an integer number (7046451954).

Almost surely, 2^66549823755 is an apocalyptic number.

66549823755 is a deficient number, since it is larger than the sum of its proper divisors (46193407509).

66549823755 is a wasteful number, since it uses less digits than its factorization.

66549823755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260979726.

The product of its digits is 54432000, while the sum is 60.

The spelling of 66549823755 in words is "sixty-six billion, five hundred forty-nine million, eight hundred twenty-three thousand, seven hundred fifty-five".