18671051993 has 8 divisors (see below), whose sum is σ = 21440442720. Its totient is φ = 16080331680.

The previous prime is 18671051983. The next prime is 18671052019. The reversal of 18671051993 is 39915017681.

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-18671051993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18671051983) 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, 44667380 + ... + 44667797.

It is an arithmetic number, because the mean of its divisors is an integer number (2680055340).

Almost surely, 2^18671051993 is an apocalyptic number.

It is an amenable number.

18671051993 is a deficient number, since it is larger than the sum of its proper divisors (2769390727).

18671051993 is a wasteful number, since it uses less digits than its factorization.

18671051993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89335207.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 18671051993 in words is "eighteen billion, six hundred seventy-one million, fifty-one thousand, nine hundred ninety-three".