2561416878 has 16 divisors (see below), whose sum is σ = 5168169936. Its totient is φ = 846249600.

The previous prime is 2561416861. The next prime is 2561416937. The reversal of 2561416878 is 8786141652.

2561416878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888273 + ... + 1889628.

It is an arithmetic number, because the mean of its divisors is an integer number (323010621).

Almost surely, 2^2561416878 is an apocalyptic number.

2561416878 is an abundant number, since it is smaller than the sum of its proper divisors (2606753058).

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

2561416878 is a wasteful number, since it uses less digits than its factorization.

2561416878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778019.

The product of its digits is 645120, while the sum is 48.

The square root of 2561416878 is about 50610.4423809949. The cubic root of 2561416878 is about 1368.2330886383.

The spelling of 2561416878 in words is "two billion, five hundred sixty-one million, four hundred sixteen thousand, eight hundred seventy-eight".