561125777123 has 2 divisors, whose sum is σ = 561125777124. Its totient is φ = 561125777122.

The previous prime is 561125777119. The next prime is 561125777129. The reversal of 561125777123 is 321777521165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561125777123 - 2² = 561125777119 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (561125777129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280562888561 + 280562888562.

It is an arithmetic number, because the mean of its divisors is an integer number (280562888562).

Almost surely, 2^561125777123 is an apocalyptic number.

561125777123 is a deficient number, since it is larger than the sum of its proper divisors (1).

561125777123 is an equidigital number, since it uses as much as digits as its factorization.

561125777123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 617400, while the sum is 47.

The spelling of 561125777123 in words is "five hundred sixty-one billion, one hundred twenty-five million, seven hundred seventy-seven thousand, one hundred twenty-three".