216651520 has 36 divisors (see below), whose sum is σ = 518951160. Its totient is φ = 86660096.

The previous prime is 216651511. The next prime is 216651521. The reversal of 216651520 is 25156612.

It is a super-2 number, since 2×216651520² = 93875762236620800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216651521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 83350 + ... + 85909.

It is an arithmetic number, because the mean of its divisors is an integer number (14415310).

Almost surely, 2^216651520 is an apocalyptic number.

216651520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216651520 is an abundant number, since it is smaller than the sum of its proper divisors (302299640).

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

216651520 is an equidigital number, since it uses as much as digits as its factorization.

216651520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169280 (or 169266 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 216651520 is about 14719.0869282031. The cubic root of 216651520 is about 600.6026537374.

The spelling of 216651520 in words is "two hundred sixteen million, six hundred fifty-one thousand, five hundred twenty".