561878878165 has 32 divisors (see below), whose sum is σ = 792269913600. Its totient is φ = 378128761920.

The previous prime is 561878878159. The next prime is 561878878181.

It is a happy number.

561878878165 is nontrivially palindromic in base 10.

561878878165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561878878165 - 2⁵ = 561878878133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561878878094 and 561878878103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6207195 + ... + 6297064.

It is an arithmetic number, because the mean of its divisors is an integer number (24758434800).

Almost surely, 2^561878878165 is an apocalyptic number.

561878878165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561878878165 is a deficient number, since it is larger than the sum of its proper divisors (230391035435).

561878878165 is a wasteful number, since it uses less digits than its factorization.

561878878165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12504337.

The product of its digits is 180633600, while the sum is 70.

The spelling of 561878878165 in words is "five hundred sixty-one billion, eight hundred seventy-eight million, eight hundred seventy-eight thousand, one hundred sixty-five".