61055055181 has 2 divisors, whose sum is σ = 61055055182. Its totient is φ = 61055055180.

The previous prime is 61055055163. The next prime is 61055055209. The reversal of 61055055181 is 18155055016.

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., 61006530025 + 48525156 = 246995^2 + 6966^2 .

It is a cyclic number.

It is not a de Polignac number, because 61055055181 - 2²³ = 61046666573 is a prime.

It is a super-2 number, since 2×61055055181² (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 61055055181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61055055781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30527527590 + 30527527591.

It is an arithmetic number, because the mean of its divisors is an integer number (30527527591).

Almost surely, 2^61055055181 is an apocalyptic number.

It is an amenable number.

61055055181 is a deficient number, since it is larger than the sum of its proper divisors (1).

61055055181 is an equidigital number, since it uses as much as digits as its factorization.

61055055181 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 61055055181 in words is "sixty-one billion, fifty-five million, fifty-five thousand, one hundred eighty-one".