561616520 has 16 divisors (see below), whose sum is σ = 1263637260. Its totient is φ = 224646592.

The previous prime is 561616513. The next prime is 561616541. The reversal of 561616520 is 25616165.

It can be written as a sum of positive squares in 2 ways, for example, as 561595204 + 21316 = 23698^2 + 146^2 .

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 3 ways as a sum of consecutive naturals, for example, 7020167 + ... + 7020246.

Almost surely, 2^561616520 is an apocalyptic number.

It is an amenable number.

561616520 is an abundant number, since it is smaller than the sum of its proper divisors (702020740).

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

561616520 is a wasteful number, since it uses less digits than its factorization.

561616520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040424 (or 14040420 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 561616520 is about 23698.4497383268. The cubic root of 561616520 is about 825.0494099578.

The spelling of 561616520 in words is "five hundred sixty-one million, six hundred sixteen thousand, five hundred twenty".