216535233516401 has 2 divisors, whose sum is σ = 216535233516402. Its totient is φ = 216535233516400.

The previous prime is 216535233516377. The next prime is 216535233516449. The reversal of 216535233516401 is 104615332535612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216531254430001 + 3979086400 = 14715001^2 + 63080^2 .

It is a cyclic number.

It is not a de Polignac number, because 216535233516401 - 2²⁶ = 216535166407537 is a prime.

It is not a weakly prime, because it can be changed into another prime (216535233516451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108267616758200 + 108267616758201.

It is an arithmetic number, because the mean of its divisors is an integer number (108267616758201).

Almost surely, 2^{216535233516401} is an apocalyptic number.

It is an amenable number.

216535233516401 is a deficient number, since it is larger than the sum of its proper divisors (1).

216535233516401 is an equidigital number, since it uses as much as digits as its factorization.

216535233516401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 216535233516401 in words is "two hundred sixteen trillion, five hundred thirty-five billion, two hundred thirty-three million, five hundred sixteen thousand, four hundred one".