561665346 has 64 divisors (see below), whose sum is σ = 1365880320. Its totient is φ = 151752960.

The previous prime is 561665333. The next prime is 561665371. The reversal of 561665346 is 643566165.

It is a junction number, because it is equal to n+sod(n) for n = 561665298 and 561665307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8145 + ... + 34491.

It is an arithmetic number, because the mean of its divisors is an integer number (21341880).

Almost surely, 2^561665346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561665346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682940160).

561665346 is an abundant number, since it is smaller than the sum of its proper divisors (804214974).

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

561665346 is a wasteful number, since it uses less digits than its factorization.

561665346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26399.

The product of its digits is 388800, while the sum is 42.

The square root of 561665346 is about 23699.4798677102. The cubic root of 561665346 is about 825.0733187364.

The spelling of 561665346 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred forty-six".