216422510665253 has 2 divisors, whose sum is σ = 216422510665254. Its totient is φ = 216422510665252.

The previous prime is 216422510665139. The next prime is 216422510665307. The reversal of 216422510665253 is 352566015224612.

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., 216369919792324 + 52590872929 = 14709518^2 + 229327^2 .

It is a cyclic number.

It is not a de Polignac number, because 216422510665253 - 2²⁴ = 216422493888037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216422510665553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108211255332626 + 108211255332627.

It is an arithmetic number, because the mean of its divisors is an integer number (108211255332627).

Almost surely, 2^{216422510665253} is an apocalyptic number.

It is an amenable number.

216422510665253 is a deficient number, since it is larger than the sum of its proper divisors (1).

216422510665253 is an equidigital number, since it uses as much as digits as its factorization.

216422510665253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184000, while the sum is 50.

Adding to 216422510665253 its reverse (352566015224612), we get a palindrome (568988525889865).

The spelling of 216422510665253 in words is "two hundred sixteen trillion, four hundred twenty-two billion, five hundred ten million, six hundred sixty-five thousand, two hundred fifty-three".