561287687827 has 2 divisors, whose sum is σ = 561287687828. Its totient is φ = 561287687826.

The previous prime is 561287687809. The next prime is 561287687869. The reversal of 561287687827 is 728786782165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561287687827 - 2²³ = 561279299219 is a prime.

It is not a weakly prime, because it can be changed into another prime (561287687897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280643843913 + 280643843914.

It is an arithmetic number, because the mean of its divisors is an integer number (280643843914).

Almost surely, 2^561287687827 is an apocalyptic number.

561287687827 is a deficient number, since it is larger than the sum of its proper divisors (1).

561287687827 is an equidigital number, since it uses as much as digits as its factorization.

561287687827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126443520, while the sum is 67.

The spelling of 561287687827 in words is "five hundred sixty-one billion, two hundred eighty-seven million, six hundred eighty-seven thousand, eight hundred twenty-seven".