561665041 has 16 divisors (see below), whose sum is σ = 646588800. Its totient is φ = 477929088.

The previous prime is 561665033. The next prime is 561665047. The reversal of 561665041 is 140566165.

It is a happy number.

It is not a de Polignac number, because 561665041 - 2³ = 561665033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561664988 and 561665006.

It is not an unprimeable number, because it can be changed into a prime (561665047) 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, 851970 + ... + 852628.

It is an arithmetic number, because the mean of its divisors is an integer number (40411800).

Almost surely, 2^561665041 is an apocalyptic number.

It is an amenable number.

561665041 is a deficient number, since it is larger than the sum of its proper divisors (84923759).

561665041 is a wasteful number, since it uses less digits than its factorization.

561665041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 561665041 is about 23699.4734329689. The cubic root of 561665041 is about 825.0731693904.

The spelling of 561665041 in words is "five hundred sixty-one million, six hundred sixty-five thousand, forty-one".