216465566113 has 2 divisors, whose sum is σ = 216465566114. Its totient is φ = 216465566112.

The previous prime is 216465566087. The next prime is 216465566117. The reversal of 216465566113 is 311665564612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138553683984 + 77911882129 = 372228^2 + 279127^2 .

It is a cyclic number.

It is not a de Polignac number, because 216465566113 - 2¹⁷ = 216465435041 is a prime.

It is not a weakly prime, because it can be changed into another prime (216465566117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108232783056 + 108232783057.

It is an arithmetic number, because the mean of its divisors is an integer number (108232783057).

Almost surely, 2^216465566113 is an apocalyptic number.

It is an amenable number.

216465566113 is a deficient number, since it is larger than the sum of its proper divisors (1).

216465566113 is an equidigital number, since it uses as much as digits as its factorization.

216465566113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 46.

The spelling of 216465566113 in words is "two hundred sixteen billion, four hundred sixty-five million, five hundred sixty-six thousand, one hundred thirteen".