55561222919 has 2 divisors, whose sum is σ = 55561222920. Its totient is φ = 55561222918.

The previous prime is 55561222831. The next prime is 55561222921. The reversal of 55561222919 is 91922216555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55561222919 - 2¹⁶ = 55561157383 is a prime.

It is a super-2 number, since 2×55561222919² (a number of 22 digits) contains 22 as substring.

Together with 55561222921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55561222019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780611459 + 27780611460.

It is an arithmetic number, because the mean of its divisors is an integer number (27780611460).

Almost surely, 2^55561222919 is an apocalyptic number.

55561222919 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561222919 is an equidigital number, since it uses as much as digits as its factorization.

55561222919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 47.

The spelling of 55561222919 in words is "fifty-five billion, five hundred sixty-one million, two hundred twenty-two thousand, nine hundred nineteen".