216805562887 has 2 divisors, whose sum is σ = 216805562888. Its totient is φ = 216805562886.

The previous prime is 216805562879. The next prime is 216805562891. The reversal of 216805562887 is 788265508612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216805562887 - 2³ = 216805562879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216805562287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108402781443 + 108402781444.

It is an arithmetic number, because the mean of its divisors is an integer number (108402781444).

Almost surely, 2^216805562887 is an apocalyptic number.

216805562887 is a deficient number, since it is larger than the sum of its proper divisors (1).

216805562887 is an equidigital number, since it uses as much as digits as its factorization.

216805562887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 216805562887 in words is "two hundred sixteen billion, eight hundred five million, five hundred sixty-two thousand, eight hundred eighty-seven".