561784556145 has 16 divisors (see below), whose sum is σ = 920778590592. Its totient is φ = 292310663040.

The previous prime is 561784556131. The next prime is 561784556149. The reversal of 561784556145 is 541655487165.

It is a happy number.

It is not a de Polignac number, because 561784556145 - 2¹⁰ = 561784555121 is a prime.

It is a super-2 number, since 2×561784556145² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561784556149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456734797 + ... + 456736026.

It is an arithmetic number, because the mean of its divisors is an integer number (57548661912).

Almost surely, 2^561784556145 is an apocalyptic number.

It is an amenable number.

561784556145 is a deficient number, since it is larger than the sum of its proper divisors (358994034447).

561784556145 is a wasteful number, since it uses less digits than its factorization.

561784556145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913470872.

The product of its digits is 20160000, while the sum is 57.

The spelling of 561784556145 in words is "five hundred sixty-one billion, seven hundred eighty-four million, five hundred fifty-six thousand, one hundred forty-five".