216662351556 has 36 divisors (see below), whose sum is σ = 588083527248. Its totient is φ = 61903528848.

The previous prime is 216662351489. The next prime is 216662351579. The reversal of 216662351556 is 655153266612.

216662351556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216662351556² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184236106 + ... + 184237281.

Almost surely, 2^216662351556 is an apocalyptic number.

It is an amenable number.

216662351556 is an abundant number, since it is smaller than the sum of its proper divisors (371421175692).

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

216662351556 is a wasteful number, since it uses less digits than its factorization.

216662351556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368473408 (or 368473399 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 48.

The spelling of 216662351556 in words is "two hundred sixteen billion, six hundred sixty-two million, three hundred fifty-one thousand, five hundred fifty-six".