5556457841821 has 2 divisors, whose sum is σ = 5556457841822. Its totient is φ = 5556457841820.

The previous prime is 5556457841807. The next prime is 5556457841843. The reversal of 5556457841821 is 1281487546555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5556457841796 + 25 = 2357214^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 5556457841821 - 2¹³ = 5556457833629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5556457841821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5556457841861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2778228920910 + 2778228920911.

It is an arithmetic number, because the mean of its divisors is an integer number (2778228920911).

Almost surely, 2^{5556457841821} is an apocalyptic number.

It is an amenable number.

5556457841821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5556457841821 is an equidigital number, since it uses as much as digits as its factorization.

5556457841821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760000, while the sum is 61.

The spelling of 5556457841821 in words is "five trillion, five hundred fifty-six billion, four hundred fifty-seven million, eight hundred forty-one thousand, eight hundred twenty-one".