561665342 has 12 divisors (see below), whose sum is σ = 980048880. Its totient is φ = 240713676.

The previous prime is 561665333. The next prime is 561665371. The reversal of 561665342 is 243566165.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 561665296 and 561665305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2865542 + ... + 2865737.

It is an arithmetic number, because the mean of its divisors is an integer number (81670740).

Almost surely, 2^561665342 is an apocalyptic number.

561665342 is a deficient number, since it is larger than the sum of its proper divisors (418383538).

561665342 is a wasteful number, since it uses less digits than its factorization.

561665342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731295 (or 5731288 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 561665342 is about 23699.4797833201. The cubic root of 561665342 is about 825.0733167778.

The spelling of 561665342 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred forty-two".