561371660 has 12 divisors (see below), whose sum is σ = 1178880528. Its totient is φ = 224548656.

The previous prime is 561371633. The next prime is 561371677. The reversal of 561371660 is 66173165.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 561371660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14034272 + ... + 14034311.

It is an arithmetic number, because the mean of its divisors is an integer number (98240044).

Almost surely, 2^561371660 is an apocalyptic number.

It is an amenable number.

561371660 is an abundant number, since it is smaller than the sum of its proper divisors (617508868).

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

561371660 is a wasteful number, since it uses less digits than its factorization.

561371660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28068592 (or 28068590 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 561371660 is about 23693.2830143904. The cubic root of 561371660 is about 824.9294876987.

The spelling of 561371660 in words is "five hundred sixty-one million, three hundred seventy-one thousand, six hundred sixty".