561223456779 has 4 divisors (see below), whose sum is σ = 748297942376. Its totient is φ = 374148971184.

The previous prime is 561223456747. The next prime is 561223456813. The reversal of 561223456779 is 977654322165.

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

It is not a de Polignac number, because 561223456779 - 2⁵ = 561223456747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561223451779) 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, 93537242794 + ... + 93537242799.

It is an arithmetic number, because the mean of its divisors is an integer number (187074485594).

Almost surely, 2^561223456779 is an apocalyptic number.

561223456779 is a deficient number, since it is larger than the sum of its proper divisors (187074485597).

561223456779 is a wasteful number, since it uses less digits than its factorization.

561223456779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187074485596.

The product of its digits is 19051200, while the sum is 57.

The spelling of 561223456779 in words is "five hundred sixty-one billion, two hundred twenty-three million, four hundred fifty-six thousand, seven hundred seventy-nine".