561735855 has 72 divisors (see below), whose sum is σ = 1038941280. Its totient is φ = 280713600.

The previous prime is 561735821. The next prime is 561735857. The reversal of 561735855 is 558537165.

561735855 is a `hidden beast` number, since 5 + 61 + 7 + 3 + 585 + 5 = 666.

It is not a de Polignac number, because 561735855 - 2¹⁷ = 561604783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 561735855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561735857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2452881 + ... + 2453109.

It is an arithmetic number, because the mean of its divisors is an integer number (14429740).

Almost surely, 2^561735855 is an apocalyptic number.

561735855 is a deficient number, since it is larger than the sum of its proper divisors (477205425).

561735855 is a wasteful number, since it uses less digits than its factorization.

561735855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 407 counting only the distinct ones).

The product of its digits is 630000, while the sum is 45.

The square root of 561735855 is about 23700.9673853200. The cubic root of 561735855 is about 825.1078426517.

The spelling of 561735855 in words is "five hundred sixty-one million, seven hundred thirty-five thousand, eight hundred fifty-five".