55839580421 has 2 divisors, whose sum is σ = 55839580422. Its totient is φ = 55839580420.

The previous prime is 55839580411. The next prime is 55839580471. The reversal of 55839580421 is 12408593855.

It is an a-pointer prime, because the next prime (55839580471) can be obtained adding 55839580421 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54515712196 + 1323868225 = 233486^2 + 36385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55839580421 is a prime.

It is a super-3 number, since 3×55839580421³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55839580421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55839580411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27919790210 + 27919790211.

It is an arithmetic number, because the mean of its divisors is an integer number (27919790211).

Almost surely, 2^55839580421 is an apocalyptic number.

It is an amenable number.

55839580421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55839580421 is an equidigital number, since it uses as much as digits as its factorization.

55839580421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728000, while the sum is 50.

The spelling of 55839580421 in words is "fifty-five billion, eight hundred thirty-nine million, five hundred eighty thousand, four hundred twenty-one".