56557548409 has 2 divisors, whose sum is σ = 56557548410. Its totient is φ = 56557548408.

The previous prime is 56557548407. The next prime is 56557548431. The reversal of 56557548409 is 90484575565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50861525625 + 5696022784 = 225525^2 + 75472^2 .

It is a cyclic number.

It is not a de Polignac number, because 56557548409 - 2¹ = 56557548407 is a prime.

Together with 56557548407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56557548407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278774204 + 28278774205.

It is an arithmetic number, because the mean of its divisors is an integer number (28278774205).

Almost surely, 2^56557548409 is an apocalyptic number.

It is an amenable number.

56557548409 is a deficient number, since it is larger than the sum of its proper divisors (1).

56557548409 is an equidigital number, since it uses as much as digits as its factorization.

56557548409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240000, while the sum is 58.

The spelling of 56557548409 in words is "fifty-six billion, five hundred fifty-seven million, five hundred forty-eight thousand, four hundred nine".