216364551889 has 2 divisors, whose sum is σ = 216364551890. Its totient is φ = 216364551888.

The previous prime is 216364551869. The next prime is 216364551937. The reversal of 216364551889 is 988155463612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169058301889 + 47306250000 = 411167^2 + 217500^2 .

It is a cyclic number.

It is not a de Polignac number, because 216364551889 - 2⁵ = 216364551857 is a prime.

It is not a weakly prime, because it can be changed into another prime (216364551869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108182275944 + 108182275945.

It is an arithmetic number, because the mean of its divisors is an integer number (108182275945).

Almost surely, 2^216364551889 is an apocalyptic number.

It is an amenable number.

216364551889 is a deficient number, since it is larger than the sum of its proper divisors (1).

216364551889 is an equidigital number, since it uses as much as digits as its factorization.

216364551889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12441600, while the sum is 58.

The spelling of 216364551889 in words is "two hundred sixteen billion, three hundred sixty-four million, five hundred fifty-one thousand, eight hundred eighty-nine".