55505161181 has 2 divisors, whose sum is σ = 55505161182. Its totient is φ = 55505161180.

The previous prime is 55505161081. The next prime is 55505161189. The reversal of 55505161181 is 18116150555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49243604281 + 6261556900 = 221909^2 + 79130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55505161181 is a prime.

It is a super-2 number, since 2×55505161181² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55505161189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752580590 + 27752580591.

It is an arithmetic number, because the mean of its divisors is an integer number (27752580591).

Almost surely, 2^55505161181 is an apocalyptic number.

It is an amenable number.

55505161181 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505161181 is an equidigital number, since it uses as much as digits as its factorization.

55505161181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30000, while the sum is 38.

The spelling of 55505161181 in words is "fifty-five billion, five hundred five million, one hundred sixty-one thousand, one hundred eighty-one".