561720077 has 4 divisors (see below), whose sum is σ = 573671616. Its totient is φ = 549768540.

The previous prime is 561720043. The next prime is 561720083. The reversal of 561720077 is 770027165.

561720077 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561720077 - 2¹⁴ = 561703693 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 (561720097) 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, 5975699 + ... + 5975792.

It is an arithmetic number, because the mean of its divisors is an integer number (143417904).

Almost surely, 2^561720077 is an apocalyptic number.

It is an amenable number.

561720077 is a deficient number, since it is larger than the sum of its proper divisors (11951539).

561720077 is a wasteful number, since it uses less digits than its factorization.

561720077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11951538.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 561720077 is about 23700.6345273708. The cubic root of 561720077 is about 825.1001173876.

The spelling of 561720077 in words is "five hundred sixty-one million, seven hundred twenty thousand, seventy-seven".