216135897756 has 12 divisors (see below), whose sum is σ = 504317094792. Its totient is φ = 72045299248.

The previous prime is 216135897709. The next prime is 216135897767. The reversal of 216135897756 is 657798531612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 216135897756.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9005662395 + ... + 9005662418.

It is an arithmetic number, because the mean of its divisors is an integer number (42026424566).

Almost surely, 2^216135897756 is an apocalyptic number.

It is an amenable number.

216135897756 is an abundant number, since it is smaller than the sum of its proper divisors (288181197036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216135897756 is a wasteful number, since it uses less digits than its factorization.

216135897756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18011324820 (or 18011324818 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 60.

The spelling of 216135897756 in words is "two hundred sixteen billion, one hundred thirty-five million, eight hundred ninety-seven thousand, seven hundred fifty-six".