216551552 has 32 divisors (see below), whose sum is σ = 493043520. Its totient is φ = 92807424.

The previous prime is 216551551. The next prime is 216551557. The reversal of 216551552 is 255155612.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (216551551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119948 + ... + 121739.

It is an arithmetic number, because the mean of its divisors is an integer number (15407610).

Almost surely, 2^216551552 is an apocalyptic number.

It is an amenable number.

216551552 is an abundant number, since it is smaller than the sum of its proper divisors (276491968).

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

216551552 is an equidigital number, since it uses as much as digits as its factorization.

216551552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241708 (or 241696 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The square root of 216551552 is about 14715.6906735634. The cubic root of 216551552 is about 600.5102622274.

The spelling of 216551552 in words is "two hundred sixteen million, five hundred fifty-one thousand, five hundred fifty-two".