66180885247 has 4 divisors (see below), whose sum is σ = 66256348936. Its totient is φ = 66105421560.

The previous prime is 66180885209. The next prime is 66180885259. The reversal of 66180885247 is 74258808166.

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 66180885247 - 2⁷ = 66180885119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66180885647) 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, 37730529 + ... + 37732282.

It is an arithmetic number, because the mean of its divisors is an integer number (16564087234).

Almost surely, 2^66180885247 is an apocalyptic number.

66180885247 is a deficient number, since it is larger than the sum of its proper divisors (75463689).

66180885247 is an equidigital number, since it uses as much as digits as its factorization.

66180885247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75463688.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 66180885247 in words is "sixty-six billion, one hundred eighty million, eight hundred eighty-five thousand, two hundred forty-seven".