66814257427 has 4 divisors (see below), whose sum is σ = 66872307456. Its totient is φ = 66756207400.

The previous prime is 66814257413. The next prime is 66814257439. The reversal of 66814257427 is 72475241866.

66814257427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66814257427 - 2¹¹ = 66814255379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66814257407) 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, 29023288 + ... + 29025589.

It is an arithmetic number, because the mean of its divisors is an integer number (16718076864).

Almost surely, 2^66814257427 is an apocalyptic number.

66814257427 is a deficient number, since it is larger than the sum of its proper divisors (58050029).

66814257427 is a wasteful number, since it uses less digits than its factorization.

66814257427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58050028.

The product of its digits is 4515840, while the sum is 52.

The spelling of 66814257427 in words is "sixty-six billion, eight hundred fourteen million, two hundred fifty-seven thousand, four hundred twenty-seven".