561722783898 has 16 divisors (see below), whose sum is σ = 1125150348960. Its totient is φ = 186956797776.

The previous prime is 561722783891. The next prime is 561722783933. The reversal of 561722783898 is 898387227165.

It is not an unprimeable number, because it can be changed into a prime (561722783891) 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 7 ways as a sum of consecutive naturals, for example, 71028265 + ... + 71036172.

It is an arithmetic number, because the mean of its divisors is an integer number (70321896810).

Almost surely, 2^561722783898 is an apocalyptic number.

561722783898 is an abundant number, since it is smaller than the sum of its proper divisors (563427565062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561722783898 is a wasteful number, since it uses less digits than its factorization.

561722783898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142065101.

The product of its digits is 81285120, while the sum is 66.

It can be divided in two parts, 561722 and 783898, that added together give a triangular number (1345620 = T₁₆₄₀).

The spelling of 561722783898 in words is "five hundred sixty-one billion, seven hundred twenty-two million, seven hundred eighty-three thousand, eight hundred ninety-eight".