52216661 has 8 divisors (see below), whose sum is σ = 59748480. Its totient is φ = 44702928.

The previous prime is 52216649. The next prime is 52216667. The reversal of 52216661 is 16661225.

52216661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52216661 - 2⁶ = 52216597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52216667) 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 7 ways as a sum of consecutive naturals, for example, 2375 + ... + 10491.

It is an arithmetic number, because the mean of its divisors is an integer number (7468560).

Almost surely, 2^52216661 is an apocalyptic number.

It is an amenable number.

52216661 is a deficient number, since it is larger than the sum of its proper divisors (7531819).

52216661 is an equidigital number, since it uses as much as digits as its factorization.

52216661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043.

The product of its digits is 4320, while the sum is 29.

The square root of 52216661 is about 7226.1096725693. The cubic root of 52216661 is about 373.7687881444.

Adding to 52216661 its reverse (16661225), we get a palindrome (68877886).

The spelling of 52216661 in words is "fifty-two million, two hundred sixteen thousand, six hundred sixty-one".