561678338873 has 2 divisors, whose sum is σ = 561678338874. Its totient is φ = 561678338872.

The previous prime is 561678338801. The next prime is 561678338899. The reversal of 561678338873 is 378833876165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540501395344 + 21176943529 = 735188^2 + 145523^2 .

It is a cyclic number.

It is not a de Polignac number, because 561678338873 - 2²² = 561674144569 is a prime.

It is not a weakly prime, because it can be changed into another prime (561678338773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280839169436 + 280839169437.

It is an arithmetic number, because the mean of its divisors is an integer number (280839169437).

Almost surely, 2^561678338873 is an apocalyptic number.

It is an amenable number.

561678338873 is a deficient number, since it is larger than the sum of its proper divisors (1).

561678338873 is an equidigital number, since it uses as much as digits as its factorization.

561678338873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121927680, while the sum is 65.

The spelling of 561678338873 in words is "five hundred sixty-one billion, six hundred seventy-eight million, three hundred thirty-eight thousand, eight hundred seventy-three".