18660842047 has 8 divisors (see below), whose sum is σ = 19872752976. Its totient is φ = 17461621632.

The previous prime is 18660842041. The next prime is 18660842129. The reversal of 18660842047 is 74024806681.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18660842047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18660841988 and 18660842006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18660842041) 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, 3169593 + ... + 3175474.

It is an arithmetic number, because the mean of its divisors is an integer number (2484094122).

Almost surely, 2^18660842047 is an apocalyptic number.

18660842047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18660842047 is a deficient number, since it is larger than the sum of its proper divisors (1211910929).

18660842047 is a wasteful number, since it uses less digits than its factorization.

18660842047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345257.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 18660842047 in words is "eighteen billion, six hundred sixty million, eight hundred forty-two thousand, forty-seven".