65516220 has 288 divisors, whose sum is σ = 257886720. Its totient is φ = 13063680.

The previous prime is 65516203. The next prime is 65516251. The reversal of 65516220 is 2261556.

65516220 is a `hidden beast` number, since 655 + 1 + 6 + 2 + 2 + 0 = 666.

It is a congruent 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 95 ways as a sum of consecutive naturals, for example, 401859 + ... + 402021.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^65516220 is an apocalyptic number.

65516220 is a gapful number since it is divisible by the number (60) 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 65516220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128943360).

65516220 is an abundant number, since it is smaller than the sum of its proper divisors (192370500).

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

65516220 is a wasteful number, since it uses less digits than its factorization.

65516220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65516220 is about 8094.2090410367. The cubic root of 65516220 is about 403.1341699735.

Adding to 65516220 its reverse (2261556), we get a palindrome (67777776).

The spelling of 65516220 in words is "sixty-five million, five hundred sixteen thousand, two hundred twenty".