55000555081 has 2 divisors, whose sum is σ = 55000555082. Its totient is φ = 55000555080.

The previous prime is 55000555031. The next prime is 55000555087. The reversal of 55000555081 is 18055500055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53499690000 + 1500865081 = 231300^2 + 38741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55000555081 is a prime.

It is a super-2 number, since 2×55000555081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55000555087) 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, 27500277540 + 27500277541.

It is an arithmetic number, because the mean of its divisors is an integer number (27500277541).

Almost surely, 2^55000555081 is an apocalyptic number.

It is an amenable number.

55000555081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55000555081 is an equidigital number, since it uses as much as digits as its factorization.

55000555081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 55000555081 in words is "fifty-five billion, five hundred fifty-five thousand, eighty-one".