556941891409 has 2 divisors, whose sum is σ = 556941891410. Its totient is φ = 556941891408.

The previous prime is 556941891371. The next prime is 556941891421. The reversal of 556941891409 is 904198149655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350171613009 + 206770278400 = 591753^2 + 454720^2 .

It is a cyclic number.

It is not a de Polignac number, because 556941891409 - 2³⁷ = 419502937937 is a prime.

It is not a weakly prime, because it can be changed into another prime (556941891469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278470945704 + 278470945705.

It is an arithmetic number, because the mean of its divisors is an integer number (278470945705).

Almost surely, 2^556941891409 is an apocalyptic number.

It is an amenable number.

556941891409 is a deficient number, since it is larger than the sum of its proper divisors (1).

556941891409 is an equidigital number, since it uses as much as digits as its factorization.

556941891409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 556941891409 in words is "five hundred fifty-six billion, nine hundred forty-one million, eight hundred ninety-one thousand, four hundred nine".