55180439989 has 2 divisors, whose sum is σ = 55180439990. Its totient is φ = 55180439988.

The previous prime is 55180439987. The next prime is 55180440001. The reversal of 55180439989 is 98993408155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34391702500 + 20788737489 = 185450^2 + 144183^2 .

It is a cyclic number.

It is not a de Polignac number, because 55180439989 - 2¹ = 55180439987 is a prime.

Together with 55180439987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55180439987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27590219994 + 27590219995.

It is an arithmetic number, because the mean of its divisors is an integer number (27590219995).

Almost surely, 2^55180439989 is an apocalyptic number.

It is an amenable number.

55180439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55180439989 is an equidigital number, since it uses as much as digits as its factorization.

55180439989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 55180439989 in words is "fifty-five billion, one hundred eighty million, four hundred thirty-nine thousand, nine hundred eighty-nine".