216064454399 has 4 divisors (see below), whose sum is σ = 225458561136. Its totient is φ = 206670347664.

The previous prime is 216064454371. The next prime is 216064454449. The reversal of 216064454399 is 993454460612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216064454399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216064454399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216064454699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4697053334 + ... + 4697053379.

It is an arithmetic number, because the mean of its divisors is an integer number (56364640284).

Almost surely, 2^216064454399 is an apocalyptic number.

216064454399 is a deficient number, since it is larger than the sum of its proper divisors (9394106737).

216064454399 is an equidigital number, since it uses as much as digits as its factorization.

216064454399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394106736.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 216064454399 in words is "two hundred sixteen billion, sixty-four million, four hundred fifty-four thousand, three hundred ninety-nine".