216530155518444 has 60 divisors (see below), whose sum is σ = 566054190671200. Its totient is φ = 72176515415712.

The previous prime is 216530155518433. The next prime is 216530155518461. The reversal of 216530155518444 is 444815551035612.

216530155518444 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 3 + 0 + 1 + 5 + 551 + 84 + 4 + 4 = 666.

It is a super-2 number, since 2×216530155518444² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 153443562 + ... + 154848270.

Almost surely, 2^{216530155518444} is an apocalyptic number.

It is an amenable number.

216530155518444 is an abundant number, since it is smaller than the sum of its proper divisors (349524035152756).

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

216530155518444 is a wasteful number, since it uses less digits than its factorization.

216530155518444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880484 (or 1880473 counting only the distinct ones).

The product of its (nonzero) digits is 11520000, while the sum is 54.

The spelling of 216530155518444 in words is "two hundred sixteen trillion, five hundred thirty billion, one hundred fifty-five million, five hundred eighteen thousand, four hundred forty-four".