561545755 has 4 divisors (see below), whose sum is σ = 673854912. Its totient is φ = 449236600.

The previous prime is 561545753. The next prime is 561545773. The reversal of 561545755 is 557545165.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 561545755 - 2¹ = 561545753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561545753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56154571 + ... + 56154580.

It is an arithmetic number, because the mean of its divisors is an integer number (168463728).

Almost surely, 2^561545755 is an apocalyptic number.

561545755 is a deficient number, since it is larger than the sum of its proper divisors (112309157).

561545755 is a wasteful number, since it uses less digits than its factorization.

561545755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112309156.

The product of its digits is 525000, while the sum is 43.

The square root of 561545755 is about 23696.9566611411. The cubic root of 561545755 is about 825.0147557814.

The spelling of 561545755 in words is "five hundred sixty-one million, five hundred forty-five thousand, seven hundred fifty-five".