55055551121 has 2 divisors, whose sum is σ = 55055551122. Its totient is φ = 55055551120.

The previous prime is 55055551073. The next prime is 55055551147. The reversal of 55055551121 is 12115555055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38931630721 + 16123920400 = 197311^2 + 126980^2 .

It is a cyclic number.

It is not a de Polignac number, because 55055551121 - 2³⁴ = 37875681937 is a prime.

It is a super-2 number, since 2×55055551121² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55055551181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27527775560 + 27527775561.

It is an arithmetic number, because the mean of its divisors is an integer number (27527775561).

Almost surely, 2^55055551121 is an apocalyptic number.

It is an amenable number.

55055551121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55055551121 is an equidigital number, since it uses as much as digits as its factorization.

55055551121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31250, while the sum is 35.

The spelling of 55055551121 in words is "fifty-five billion, fifty-five million, five hundred fifty-one thousand, one hundred twenty-one".