561665330 has 16 divisors (see below), whose sum is σ = 1045860120. Its totient is φ = 216918912.

The previous prime is 561665311. The next prime is 561665333. The reversal of 561665330 is 33566165.

It can be written as a sum of positive squares in 4 ways, for example, as 312688489 + 248976841 = 17683^2 + 15779^2 .

It is not an unprimeable number, because it can be changed into a prime (561665333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968099 + ... + 968678.

Almost surely, 2^561665330 is an apocalyptic number.

561665330 is a deficient number, since it is larger than the sum of its proper divisors (484194790).

561665330 is a wasteful number, since it uses less digits than its factorization.

561665330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936813.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 561665330 is about 23699.4795301500. The cubic root of 561665330 is about 825.0733109019.

The spelling of 561665330 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred thirty".