18660542689 has 8 divisors (see below), whose sum is σ = 19625195520. Its totient is φ = 17708666976.

The previous prime is 18660542671. The next prime is 18660542707. The reversal of 18660542689 is 98624506681.

It is an interprime number because it is at equal distance from previous prime (18660542671) and next prime (18660542707).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18660542689 - 2⁵ = 18660542657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18660542639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3191284 + ... + 3197125.

It is an arithmetic number, because the mean of its divisors is an integer number (2453149440).

Almost surely, 2^18660542689 is an apocalyptic number.

It is an amenable number.

18660542689 is a deficient number, since it is larger than the sum of its proper divisors (964652831).

18660542689 is a wasteful number, since it uses less digits than its factorization.

18660542689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388559.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 18660542689 in words is "eighteen billion, six hundred sixty million, five hundred forty-two thousand, six hundred eighty-nine".