561243252561 has 16 divisors (see below), whose sum is σ = 756085473024. Its totient is φ = 370282074624.

The previous prime is 561243252547. The next prime is 561243252571. The reversal of 561243252561 is 165252342165.

It is not a de Polignac number, because 561243252561 - 2¹³ = 561243244369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561243252571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5618296 + ... + 5717318.

It is an arithmetic number, because the mean of its divisors is an integer number (47255342064).

Almost surely, 2^561243252561 is an apocalyptic number.

It is an amenable number.

561243252561 is a deficient number, since it is larger than the sum of its proper divisors (194842220463).

561243252561 is a wasteful number, since it uses less digits than its factorization.

561243252561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118600.

The product of its digits is 432000, while the sum is 42.

The spelling of 561243252561 in words is "five hundred sixty-one billion, two hundred forty-three million, two hundred fifty-two thousand, five hundred sixty-one".