561055105987 has 2 divisors, whose sum is σ = 561055105988. Its totient is φ = 561055105986.

The previous prime is 561055105979. The next prime is 561055106021. The reversal of 561055105987 is 789501550165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561055105987 - 2³ = 561055105979 is a prime.

It is not a weakly prime, because it can be changed into another prime (561055105927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280527552993 + 280527552994.

It is an arithmetic number, because the mean of its divisors is an integer number (280527552994).

Almost surely, 2^561055105987 is an apocalyptic number.

561055105987 is a deficient number, since it is larger than the sum of its proper divisors (1).

561055105987 is an equidigital number, since it uses as much as digits as its factorization.

561055105987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890000, while the sum is 52.

The spelling of 561055105987 in words is "five hundred sixty-one billion, fifty-five million, one hundred five thousand, nine hundred eighty-seven".