553216661 has 8 divisors (see below), whose sum is σ = 557689440. Its totient is φ = 548756208.

The previous prime is 553216591. The next prime is 553216681. The reversal of 553216661 is 166612355.

553216661 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 a de Polignac number, because none of the positive numbers 2^k-553216661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553216681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100790 + ... + 106136.

It is an arithmetic number, because the mean of its divisors is an integer number (69711180).

Almost surely, 2^553216661 is an apocalyptic number.

It is an amenable number.

553216661 is a deficient number, since it is larger than the sum of its proper divisors (4472779).

553216661 is a wasteful number, since it uses less digits than its factorization.

553216661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6163.

The product of its digits is 32400, while the sum is 35.

The square root of 553216661 is about 23520.5582629325. The cubic root of 553216661 is about 820.9154266994.

The spelling of 553216661 in words is "five hundred fifty-three million, two hundred sixteen thousand, six hundred sixty-one".