561276667 has 4 divisors (see below), whose sum is σ = 641459056. Its totient is φ = 481094280.

The previous prime is 561276649. The next prime is 561276673. The reversal of 561276667 is 766672165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561276667 - 2¹¹ = 561274619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561276647) 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 3 ways as a sum of consecutive naturals, for example, 40091184 + ... + 40091197.

It is an arithmetic number, because the mean of its divisors is an integer number (160364764).

Almost surely, 2^561276667 is an apocalyptic number.

561276667 is a deficient number, since it is larger than the sum of its proper divisors (80182389).

561276667 is an equidigital number, since it uses as much as digits as its factorization.

561276667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80182388.

The product of its digits is 635040, while the sum is 46.

The square root of 561276667 is about 23691.2782896998. The cubic root of 561276667 is about 824.8829546838.

The spelling of 561276667 in words is "five hundred sixty-one million, two hundred seventy-six thousand, six hundred sixty-seven".