66218328427 has 4 divisors (see below), whose sum is σ = 66219385456. Its totient is φ = 66217271400.

The previous prime is 66218328383. The next prime is 66218328433. The reversal of 66218328427 is 72482381266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66218328427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66218328497) 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, 428199 + ... + 561952.

It is an arithmetic number, because the mean of its divisors is an integer number (16554846364).

Almost surely, 2^66218328427 is an apocalyptic number.

66218328427 is a deficient number, since it is larger than the sum of its proper divisors (1057029).

66218328427 is an equidigital number, since it uses as much as digits as its factorization.

66218328427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057028.

The product of its digits is 1548288, while the sum is 49.

The spelling of 66218328427 in words is "sixty-six billion, two hundred eighteen million, three hundred twenty-eight thousand, four hundred twenty-seven".