55505161081 has 2 divisors, whose sum is σ = 55505161082. Its totient is φ = 55505161080.

The previous prime is 55505161051. The next prime is 55505161181. The reversal of 55505161081 is 18016150555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54576435456 + 928725625 = 233616^2 + 30475^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505161081 - 2¹¹ = 55505159033 is a prime.

It is a super-2 number, since 2×55505161081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55505161081.

It is not a weakly prime, because it can be changed into another prime (55505161051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752580540 + 27752580541.

It is an arithmetic number, because the mean of its divisors is an integer number (27752580541).

Almost surely, 2^55505161081 is an apocalyptic number.

It is an amenable number.

55505161081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505161081 is an equidigital number, since it uses as much as digits as its factorization.

55505161081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30000, while the sum is 37.

The spelling of 55505161081 in words is "fifty-five billion, five hundred five million, one hundred sixty-one thousand, eighty-one".