55500500581 has 2 divisors, whose sum is σ = 55500500582. Its totient is φ = 55500500580.

The previous prime is 55500500557. The next prime is 55500500611. The reversal of 55500500581 is 18500500555.

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., 52436878081 + 3063622500 = 228991^2 + 55350^2 .

It is a cyclic number.

It is not a de Polignac number, because 55500500581 - 2¹¹ = 55500498533 is a prime.

It is a super-2 number, since 2×55500500581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55500504581) 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, 27750250290 + 27750250291.

It is an arithmetic number, because the mean of its divisors is an integer number (27750250291).

Almost surely, 2^55500500581 is an apocalyptic number.

It is an amenable number.

55500500581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500500581 is an equidigital number, since it uses as much as digits as its factorization.

55500500581 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 55500500581 in words is "fifty-five billion, five hundred million, five hundred thousand, five hundred eighty-one".