5561778894 has 64 divisors (see below), whose sum is σ = 13012918272. Its totient is φ = 1551967200.

The previous prime is 5561778889. The next prime is 5561778917. The reversal of 5561778894 is 4988771655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310359 + ... + 327789.

It is an arithmetic number, because the mean of its divisors is an integer number (203326848).

Almost surely, 2^5561778894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5561778894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6506459136).

5561778894 is an abundant number, since it is smaller than the sum of its proper divisors (7451139378).

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

5561778894 is a wasteful number, since it uses less digits than its factorization.

5561778894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17621.

The product of its digits is 16934400, while the sum is 60.

The square root of 5561778894 is about 74577.3349885875. The cubic root of 5561778894 is about 1771.7586969104.

The spelling of 5561778894 in words is "five billion, five hundred sixty-one million, seven hundred seventy-eight thousand, eight hundred ninety-four".