561546401263 has 2 divisors, whose sum is σ = 561546401264. Its totient is φ = 561546401262.

The previous prime is 561546401243. The next prime is 561546401279. The reversal of 561546401263 is 362104645165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561546401263 - 2³⁷ = 424107447791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561546401243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280773200631 + 280773200632.

It is an arithmetic number, because the mean of its divisors is an integer number (280773200632).

Almost surely, 2^561546401263 is an apocalyptic number.

561546401263 is a deficient number, since it is larger than the sum of its proper divisors (1).

561546401263 is an equidigital number, since it uses as much as digits as its factorization.

561546401263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 561546401263 in words is "five hundred sixty-one billion, five hundred forty-six million, four hundred one thousand, two hundred sixty-three".