55221663449 has 2 divisors, whose sum is σ = 55221663450. Its totient is φ = 55221663448.

The previous prime is 55221663437. The next prime is 55221663451. The reversal of 55221663449 is 94436612255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40002000025 + 15219663424 = 200005^2 + 123368^2 .

It is a cyclic number.

It is not a de Polignac number, because 55221663449 - 2²⁸ = 54953227993 is a prime.

It is a super-2 number, since 2×55221663449² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 55221663451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55221663649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610831724 + 27610831725.

It is an arithmetic number, because the mean of its divisors is an integer number (27610831725).

Almost surely, 2^55221663449 is an apocalyptic number.

It is an amenable number.

55221663449 is a deficient number, since it is larger than the sum of its proper divisors (1).

55221663449 is an equidigital number, since it uses as much as digits as its factorization.

55221663449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 47.

The spelling of 55221663449 in words is "fifty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-nine".