216673572187 has 2 divisors, whose sum is σ = 216673572188. Its totient is φ = 216673572186.

The previous prime is 216673572173. The next prime is 216673572209. The reversal of 216673572187 is 781275376612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216673572187 is a prime.

It is not a weakly prime, because it can be changed into another prime (216673572107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108336786093 + 108336786094.

It is an arithmetic number, because the mean of its divisors is an integer number (108336786094).

Almost surely, 2^216673572187 is an apocalyptic number.

216673572187 is a deficient number, since it is larger than the sum of its proper divisors (1).

216673572187 is an equidigital number, since it uses as much as digits as its factorization.

216673572187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 55.

The spelling of 216673572187 in words is "two hundred sixteen billion, six hundred seventy-three million, five hundred seventy-two thousand, one hundred eighty-seven".