216551604156 has 12 divisors (see below), whose sum is σ = 505287076392. Its totient is φ = 72183868048.

The previous prime is 216551604083. The next prime is 216551604167. The reversal of 216551604156 is 651406155612.

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

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, 9022983495 + ... + 9022983518.

It is an arithmetic number, because the mean of its divisors is an integer number (42107256366).

Almost surely, 2^216551604156 is an apocalyptic number.

It is an amenable number.

216551604156 is an abundant number, since it is smaller than the sum of its proper divisors (288735472236).

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

216551604156 is a wasteful number, since it uses less digits than its factorization.

216551604156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18045967020 (or 18045967018 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

Adding to 216551604156 its reverse (651406155612), we get a palindrome (867957759768).

The spelling of 216551604156 in words is "two hundred sixteen billion, five hundred fifty-one million, six hundred four thousand, one hundred fifty-six".