561167278 has 32 divisors (see below), whose sum is σ = 980688384. Its totient is φ = 235874592.

The previous prime is 561167273. The next prime is 561167291. The reversal of 561167278 is 872761165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561167273) 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 15 ways as a sum of consecutive naturals, for example, 152476 + ... + 156112.

It is an arithmetic number, because the mean of its divisors is an integer number (30646512).

Almost surely, 2^561167278 is an apocalyptic number.

561167278 is a deficient number, since it is larger than the sum of its proper divisors (419521106).

561167278 is a wasteful number, since it uses less digits than its factorization.

561167278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856.

The product of its digits is 141120, while the sum is 43.

The square root of 561167278 is about 23688.9695428062. The cubic root of 561167278 is about 824.8293631787.

The spelling of 561167278 in words is "five hundred sixty-one million, one hundred sixty-seven thousand, two hundred seventy-eight".