561778507 has 4 divisors (see below), whose sum is σ = 567570136. Its totient is φ = 555986880.

The previous prime is 561778493. The next prime is 561778513. The reversal of 561778507 is 705877165.

561778507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 561778507 - 2¹¹ = 561776459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561778537) 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, 2895669 + ... + 2895862.

It is an arithmetic number, because the mean of its divisors is an integer number (141892534).

Almost surely, 2^561778507 is an apocalyptic number.

561778507 is a deficient number, since it is larger than the sum of its proper divisors (5791629).

561778507 is an equidigital number, since it uses as much as digits as its factorization.

561778507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791628.

The product of its (nonzero) digits is 411600, while the sum is 46.

The square root of 561778507 is about 23701.8671627364. The cubic root of 561778507 is about 825.1287253072.

The spelling of 561778507 in words is "five hundred sixty-one million, seven hundred seventy-eight thousand, five hundred seven".