18671933887 has 2 divisors, whose sum is σ = 18671933888. Its totient is φ = 18671933886.

The previous prime is 18671933873. The next prime is 18671933909. The reversal of 18671933887 is 78833917681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18671933887 - 2¹⁹ = 18671409599 is a prime.

It is a super-2 number, since 2×18671933887² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18671933837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335966943 + 9335966944.

It is an arithmetic number, because the mean of its divisors is an integer number (9335966944).

Almost surely, 2^18671933887 is an apocalyptic number.

18671933887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18671933887 is an equidigital number, since it uses as much as digits as its factorization.

18671933887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 61.

The spelling of 18671933887 in words is "eighteen billion, six hundred seventy-one million, nine hundred thirty-three thousand, eight hundred eighty-seven".