55505505050081 has 2 divisors, whose sum is σ = 55505505050082. Its totient is φ = 55505505050080.

The previous prime is 55505505049963. The next prime is 55505505050101. The reversal of 55505505050081 is 18005050550555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47665975443025 + 7839529607056 = 6904055^2 + 2799916^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505505050081 - 2¹⁴ = 55505505033697 is a prime.

It is a super-2 number, since 2×55505505050081² (a number of 28 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 (55505505056081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752752525040 + 27752752525041.

It is an arithmetic number, because the mean of its divisors is an integer number (27752752525041).

Almost surely, 2^{55505505050081} is an apocalyptic number.

It is an amenable number.

55505505050081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505505050081 is an equidigital number, since it uses as much as digits as its factorization.

55505505050081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 625000, while the sum is 44.

The spelling of 55505505050081 in words is "fifty-five trillion, five hundred five billion, five hundred five million, fifty thousand, eighty-one".