216887663191 has 2 divisors, whose sum is σ = 216887663192. Its totient is φ = 216887663190.

The previous prime is 216887663147. The next prime is 216887663207. The reversal of 216887663191 is 191366788612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216887663191 - 2²³ = 216879274583 is a prime.

It is a super-3 number, since 3×216887663191³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216887663791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108443831595 + 108443831596.

It is an arithmetic number, because the mean of its divisors is an integer number (108443831596).

Almost surely, 2^216887663191 is an apocalyptic number.

216887663191 is a deficient number, since it is larger than the sum of its proper divisors (1).

216887663191 is an equidigital number, since it uses as much as digits as its factorization.

216887663191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The spelling of 216887663191 in words is "two hundred sixteen billion, eight hundred eighty-seven million, six hundred sixty-three thousand, one hundred ninety-one".