666505030427 has 4 divisors (see below), whose sum is σ = 684518679936. Its totient is φ = 648491380920.

The previous prime is 666505030417. The next prime is 666505030439. The reversal of 666505030427 is 724030505666.

It is a happy number.

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 666505030427 - 2¹⁰ = 666505029403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666505030417) 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 3 ways as a sum of consecutive naturals, for example, 9006824699 + ... + 9006824772.

It is an arithmetic number, because the mean of its divisors is an integer number (171129669984).

Almost surely, 2^666505030427 is an apocalyptic number.

666505030427 is a deficient number, since it is larger than the sum of its proper divisors (18013649509).

666505030427 is a wasteful number, since it uses less digits than its factorization.

666505030427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18013649508.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 666505030427 in words is "six hundred sixty-six billion, five hundred five million, thirty thousand, four hundred twenty-seven".