18666552427 has 4 divisors (see below), whose sum is σ = 18841006296. Its totient is φ = 18492098560.

The previous prime is 18666552397. The next prime is 18666552433. The reversal of 18666552427 is 72425566681.

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-18666552427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18666552127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87226774 + ... + 87226987.

It is an arithmetic number, because the mean of its divisors is an integer number (4710251574).

Almost surely, 2^18666552427 is an apocalyptic number.

18666552427 is a deficient number, since it is larger than the sum of its proper divisors (174453869).

18666552427 is a wasteful number, since it uses less digits than its factorization.

18666552427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174453868.

The product of its digits is 4838400, while the sum is 52.

The spelling of 18666552427 in words is "eighteen billion, six hundred sixty-six million, five hundred fifty-two thousand, four hundred twenty-seven".