6521879400457 has 2 divisors, whose sum is σ = 6521879400458. Its totient is φ = 6521879400456.

The previous prime is 6521879400397. The next prime is 6521879400497. The reversal of 6521879400457 is 7540049781256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6254945978121 + 266933422336 = 2500989^2 + 516656^2 .

It is a cyclic number.

It is not a de Polignac number, because 6521879400457 - 2¹¹ = 6521879398409 is a prime.

It is not a weakly prime, because it can be changed into another prime (6521879400497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260939700228 + 3260939700229.

It is an arithmetic number, because the mean of its divisors is an integer number (3260939700229).

Almost surely, 2^{6521879400457} is an apocalyptic number.

It is an amenable number.

6521879400457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6521879400457 is an equidigital number, since it uses as much as digits as its factorization.

6521879400457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 6521879400457 in words is "six trillion, five hundred twenty-one billion, eight hundred seventy-nine million, four hundred thousand, four hundred fifty-seven".