8561278278 has 24 divisors (see below), whose sum is σ = 21199356048. Its totient is φ = 2446079472.

The previous prime is 8561278261. The next prime is 8561278283. The reversal of 8561278278 is 8728721658.

8561278278 is a `hidden beast` number, since 8 + 561 + 2 + 7 + 8 + 2 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33973201 + ... + 33973452.

It is an arithmetic number, because the mean of its divisors is an integer number (883306502).

Almost surely, 2^8561278278 is an apocalyptic number.

8561278278 is an abundant number, since it is smaller than the sum of its proper divisors (12638077770).

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

8561278278 is a wasteful number, since it uses less digits than its factorization.

8561278278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67946668 (or 67946665 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 8561278278 is about 92527.1758890327. The cubic root of 8561278278 is about 2045.7200635801.

The spelling of 8561278278 in words is "eight billion, five hundred sixty-one million, two hundred seventy-eight thousand, two hundred seventy-eight".