66310640227 has 4 divisors (see below), whose sum is σ = 71411458720. Its totient is φ = 61209821736.

The previous prime is 66310640177. The next prime is 66310640251. The reversal of 66310640227 is 72204601366.

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 66310640227 - 2²³ = 66302251619 is a prime.

It is a super-2 number, since 2×66310640227² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66310640267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550409227 + ... + 2550409252.

It is an arithmetic number, because the mean of its divisors is an integer number (17852864680).

Almost surely, 2^66310640227 is an apocalyptic number.

66310640227 is a deficient number, since it is larger than the sum of its proper divisors (5100818493).

66310640227 is a wasteful number, since it uses less digits than its factorization.

66310640227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100818492.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 66310640227 in words is "sixty-six billion, three hundred ten million, six hundred forty thousand, two hundred twenty-seven".