55660219 has 2 divisors, whose sum is σ = 55660220. Its totient is φ = 55660218.

The previous prime is 55660211. The next prime is 55660259. The reversal of 55660219 is 91206655.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55660219 - 2³ = 55660211 is a prime.

It is a super-2 number, since 2×55660219² = 6196119958255922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55660211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27830109 + 27830110.

It is an arithmetic number, because the mean of its divisors is an integer number (27830110).

Almost surely, 2^55660219 is an apocalyptic number.

55660219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55660219 is an equidigital number, since it uses as much as digits as its factorization.

55660219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 55660219 is about 7460.5776585999. The cubic root of 55660219 is about 381.8108833364.

The spelling of 55660219 in words is "fifty-five million, six hundred sixty thousand, two hundred nineteen".