561667345 has 8 divisors (see below), whose sum is σ = 680949864. Its totient is φ = 444701184.

The previous prime is 561667243. The next prime is 561667367. The reversal of 561667345 is 543766165.

It can be written as a sum of positive squares in 4 ways, for example, as 70291456 + 491375889 = 8384^2 + 22167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561667345 - 2⁷ = 561667217 is a prime.

It is a Duffinian 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, 578554 + ... + 579523.

It is an arithmetic number, because the mean of its divisors is an integer number (85118733).

Almost surely, 2^561667345 is an apocalyptic number.

It is an amenable number.

561667345 is a deficient number, since it is larger than the sum of its proper divisors (119282519).

561667345 is a wasteful number, since it uses less digits than its factorization.

561667345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158179.

The product of its digits is 453600, while the sum is 43.

The square root of 561667345 is about 23699.5220415940. The cubic root of 561667345 is about 825.0742975634.

The spelling of 561667345 in words is "five hundred sixty-one million, six hundred sixty-seven thousand, three hundred forty-five".