561065505 has 192 divisors, whose sum is σ = 1258414080. Its totient is φ = 207567360.

The previous prime is 561065441. The next prime is 561065507. The reversal of 561065505 is 505560165.

It is not a de Polignac number, because 561065505 - 2⁶ = 561065441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561065507) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 7102056 + ... + 7102134.

It is an arithmetic number, because the mean of its divisors is an integer number (6554240).

Almost surely, 2^561065505 is an apocalyptic number.

561065505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561065505 is an abundant number, since it is smaller than the sum of its proper divisors (697348575).

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

561065505 is a wasteful number, since it uses less digits than its factorization.

561065505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 561065505 is about 23686.8213359243. The cubic root of 561065505 is about 824.7794966254.

The spelling of 561065505 in words is "five hundred sixty-one million, sixty-five thousand, five hundred five".