216551655500 has 96 divisors (see below), whose sum is σ = 476574658560. Its totient is φ = 85958385600.

The previous prime is 216551655499. The next prime is 216551655557. The reversal of 216551655500 is 5556155612.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 60034697 + ... + 60038303.

It is an arithmetic number, because the mean of its divisors is an integer number (4964319360).

Almost surely, 2^216551655500 is an apocalyptic number.

216551655500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216551655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238287329280).

216551655500 is an abundant number, since it is smaller than the sum of its proper divisors (260023003060).

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

216551655500 is a wasteful number, since it uses less digits than its factorization.

216551655500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4500 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 216551655500 in words is "two hundred sixteen billion, five hundred fifty-one million, six hundred fifty-five thousand, five hundred".