216206885265464 has 32 divisors (see below), whose sum is σ = 430994857439520. Its totient is φ = 101452287421056.

The previous prime is 216206885265367. The next prime is 216206885265479. The reversal of 216206885265464 is 464562588602612.

It is a happy number.

It is a super-2 number, since 2×216206885265464² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216206885265464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11085248927 + ... + 11085268430.

It is an arithmetic number, because the mean of its divisors is an integer number (13468589294985).

Almost surely, 2^{216206885265464} is an apocalyptic number.

It is an amenable number.

216206885265464 is a deficient number, since it is larger than the sum of its proper divisors (214787972174056).

216206885265464 is a wasteful number, since it uses less digits than its factorization.

216206885265464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22170517439 (or 22170517435 counting only the distinct ones).

The product of its (nonzero) digits is 265420800, while the sum is 65.

The spelling of 216206885265464 in words is "two hundred sixteen trillion, two hundred six billion, eight hundred eighty-five million, two hundred sixty-five thousand, four hundred sixty-four".