561648742232779 has 2 divisors, whose sum is σ = 561648742232780. Its totient is φ = 561648742232778.

The previous prime is 561648742232759. The next prime is 561648742232797. The reversal of 561648742232779 is 977232247846165.

Together with next prime (561648742232797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561648742232779 is a prime.

It is not a weakly prime, because it can be changed into another prime (561648742232759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280824371116389 + 280824371116390.

It is an arithmetic number, because the mean of its divisors is an integer number (280824371116390).

Almost surely, 2^{561648742232779} is an apocalyptic number.

561648742232779 is a deficient number, since it is larger than the sum of its proper divisors (1).

561648742232779 is an equidigital number, since it uses as much as digits as its factorization.

561648742232779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1706987520, while the sum is 73.

The spelling of 561648742232779 in words is "five hundred sixty-one trillion, six hundred forty-eight billion, seven hundred forty-two million, two hundred thirty-two thousand, seven hundred seventy-nine".