561775536 has 120 divisors (see below), whose sum is σ = 1813628960. Its totient is φ = 159003648.

The previous prime is 561775531. The next prime is 561775541. The reversal of 561775536 is 635577165.

561775536 is a `hidden beast` number, since 561 + 7 + 7 + 55 + 36 = 666.

It is an interprime number because it is at equal distance from previous prime (561775531) and next prime (561775541).

It is a junction number, because it is equal to n+sod(n) for n = 561775491 and 561775500.

It is not an unprimeable number, because it can be changed into a prime (561775531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107316 + ... + 112428.

Almost surely, 2^561775536 is an apocalyptic number.

561775536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561775536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906814480).

561775536 is an abundant number, since it is smaller than the sum of its proper divisors (1251853424).

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

561775536 is a wasteful number, since it uses less digits than its factorization.

561775536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243 (or 5234 counting only the distinct ones).

The product of its digits is 661500, while the sum is 45.

The square root of 561775536 is about 23701.8044882663. The cubic root of 561775536 is about 825.1272707234.

The spelling of 561775536 in words is "five hundred sixty-one million, seven hundred seventy-five thousand, five hundred thirty-six".