561105660 has 24 divisors (see below), whose sum is σ = 1571096016. Its totient is φ = 149628160.

The previous prime is 561105653. The next prime is 561105683. The reversal of 561105660 is 66501165.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4675821 + ... + 4675940.

It is an arithmetic number, because the mean of its divisors is an integer number (65462334).

Almost surely, 2^561105660 is an apocalyptic number.

It is an amenable number.

561105660 is an abundant number, since it is smaller than the sum of its proper divisors (1009990356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561105660 is a wasteful number, since it uses less digits than its factorization.

561105660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9351773 (or 9351771 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 561105660 is about 23687.6689439886. The cubic root of 561105660 is about 824.7991724210.

The spelling of 561105660 in words is "five hundred sixty-one million, one hundred five thousand, six hundred sixty".