55255199981 has 2 divisors, whose sum is σ = 55255199982. Its totient is φ = 55255199980.

The previous prime is 55255199947. The next prime is 55255200047. The reversal of 55255199981 is 18999155255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52036453225 + 3218746756 = 228115^2 + 56734^2 .

It is a cyclic number.

It is not a de Polignac number, because 55255199981 - 2⁶ = 55255199917 is a prime.

It is a super-2 number, since 2×55255199981² (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 55255199981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55255199921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627599990 + 27627599991.

It is an arithmetic number, because the mean of its divisors is an integer number (27627599991).

Almost surely, 2^55255199981 is an apocalyptic number.

It is an amenable number.

55255199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55255199981 is an equidigital number, since it uses as much as digits as its factorization.

55255199981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290000, while the sum is 59.

The spelling of 55255199981 in words is "fifty-five billion, two hundred fifty-five million, one hundred ninety-nine thousand, nine hundred eighty-one".