216554660 has 96 divisors (see below), whose sum is σ = 548190720. Its totient is φ = 70253568.

The previous prime is 216554651. The next prime is 216554671. The reversal of 216554660 is 66455612.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 216554660.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 350672 + ... + 351288.

It is an arithmetic number, because the mean of its divisors is an integer number (5710320).

Almost surely, 2^216554660 is an apocalyptic number.

216554660 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 216554660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274095360).

216554660 is an abundant number, since it is smaller than the sum of its proper divisors (331636060).

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

216554660 is a wasteful number, since it uses less digits than its factorization.

216554660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 216554660 is about 14715.7962747518. The cubic root of 216554660 is about 600.5131351029.

The spelling of 216554660 in words is "two hundred sixteen million, five hundred fifty-four thousand, six hundred sixty".