55216559 has 2 divisors, whose sum is σ = 55216560. Its totient is φ = 55216558.

The previous prime is 55216541. The next prime is 55216591. The reversal of 55216559 is 95561255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55216559 - 2⁸ = 55216303 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55216519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27608279 + 27608280.

It is an arithmetic number, because the mean of its divisors is an integer number (27608280).

Almost surely, 2^55216559 is an apocalyptic number.

55216559 is a deficient number, since it is larger than the sum of its proper divisors (1).

55216559 is an equidigital number, since it uses as much as digits as its factorization.

55216559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67500, while the sum is 38.

The square root of 55216559 is about 7430.7845480810. The cubic root of 55216559 is about 380.7937218522.

The spelling of 55216559 in words is "fifty-five million, two hundred sixteen thousand, five hundred fifty-nine".