5478826420981 has 2 divisors, whose sum is σ = 5478826420982. Its totient is φ = 5478826420980.

The previous prime is 5478826420979. The next prime is 5478826421059. The reversal of 5478826420981 is 1890246288745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4740378372081 + 738448048900 = 2177241^2 + 859330^2 .

It is a cyclic number.

It is not a de Polignac number, because 5478826420981 - 2¹ = 5478826420979 is a prime.

It is a super-2 number, since 2×5478826420981² (a number of 26 digits) contains 22 as substring.

Together with 5478826420979, 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 (5478826420931) 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, 2739413210490 + 2739413210491.

It is an arithmetic number, because the mean of its divisors is an integer number (2739413210491).

Almost surely, 2^{5478826420981} is an apocalyptic number.

It is an amenable number.

5478826420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5478826420981 is an equidigital number, since it uses as much as digits as its factorization.

5478826420981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61931520, while the sum is 64.

The spelling of 5478826420981 in words is "five trillion, four hundred seventy-eight billion, eight hundred twenty-six million, four hundred twenty thousand, nine hundred eighty-one".