561742847867501 has 2 divisors, whose sum is σ = 561742847867502. Its totient is φ = 561742847867500.

The previous prime is 561742847867479. The next prime is 561742847867519. The reversal of 561742847867501 is 105768748247165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309590711136100 + 252152136731401 = 17595190^2 + 15879299^2 .

It is a cyclic number.

It is not a de Polignac number, because 561742847867501 - 2¹⁰ = 561742847866477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561742849867501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280871423933750 + 280871423933751.

It is an arithmetic number, because the mean of its divisors is an integer number (280871423933751).

Almost surely, 2^{561742847867501} is an apocalyptic number.

It is an amenable number.

561742847867501 is a deficient number, since it is larger than the sum of its proper divisors (1).

561742847867501 is an equidigital number, since it uses as much as digits as its factorization.

561742847867501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 632217600, while the sum is 71.

The spelling of 561742847867501 in words is "five hundred sixty-one trillion, seven hundred forty-two billion, eight hundred forty-seven million, eight hundred sixty-seven thousand, five hundred one".