561557116427 has 2 divisors, whose sum is σ = 561557116428. Its totient is φ = 561557116426.

The previous prime is 561557116363. The next prime is 561557116457. The reversal of 561557116427 is 724611755165.

561557116427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561557116427 - 2⁶ = 561557116363 is a prime.

It is not a weakly prime, because it can be changed into another prime (561557116457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280778558213 + 280778558214.

It is an arithmetic number, because the mean of its divisors is an integer number (280778558214).

Almost surely, 2^561557116427 is an apocalyptic number.

561557116427 is a deficient number, since it is larger than the sum of its proper divisors (1).

561557116427 is an equidigital number, since it uses as much as digits as its factorization.

561557116427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 50.

The spelling of 561557116427 in words is "five hundred sixty-one billion, five hundred fifty-seven million, one hundred sixteen thousand, four hundred twenty-seven".