216888685952399 has 4 divisors (see below), whose sum is σ = 217835798118360. Its totient is φ = 215941573786440.

The previous prime is 216888685952387. The next prime is 216888685952413. The reversal of 216888685952399 is 993259586888612.

216888685952399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216888685952399 - 2⁴⁰ = 215789174324623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216888685952599) 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, 473556082637 + ... + 473556083094.

It is an arithmetic number, because the mean of its divisors is an integer number (54458949529590).

Almost surely, 2^{216888685952399} is an apocalyptic number.

216888685952399 is a deficient number, since it is larger than the sum of its proper divisors (947112165961).

216888685952399 is an equidigital number, since it uses as much as digits as its factorization.

216888685952399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947112165960.

The product of its digits is 32248627200, while the sum is 89.

The spelling of 216888685952399 in words is "two hundred sixteen trillion, eight hundred eighty-eight billion, six hundred eighty-five million, nine hundred fifty-two thousand, three hundred ninety-nine".