561066501 has 4 divisors (see below), whose sum is σ = 748088672. Its totient is φ = 374044332.

The previous prime is 561066497. The next prime is 561066553. The reversal of 561066501 is 105660165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 561066501 - 2² = 561066497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561066001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93511081 + ... + 93511086.

It is an arithmetic number, because the mean of its divisors is an integer number (187022168).

Almost surely, 2^561066501 is an apocalyptic number.

It is an amenable number.

561066501 is a deficient number, since it is larger than the sum of its proper divisors (187022171).

561066501 is a wasteful number, since it uses less digits than its factorization.

561066501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187022170.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 561066501 is about 23686.8423602641. The cubic root of 561066501 is about 824.7799846729.

The spelling of 561066501 in words is "five hundred sixty-one million, sixty-six thousand, five hundred one".