561665261104 has 20 divisors (see below), whose sum is σ = 1117637970064. Its totient is φ = 273242559168.

The previous prime is 561665261093. The next prime is 561665261107. The reversal of 561665261104 is 401162566165.

561665261104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (561665261107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474378852 + ... + 474380035.

Almost surely, 2^561665261104 is an apocalyptic number.

It is an amenable number.

561665261104 is a deficient number, since it is larger than the sum of its proper divisors (555972708960).

561665261104 is a wasteful number, since it uses less digits than its factorization.

561665261104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948758932 (or 948758926 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 561665261104 in words is "five hundred sixty-one billion, six hundred sixty-five million, two hundred sixty-one thousand, one hundred four".