561706657 has 8 divisors (see below), whose sum is σ = 577360296. Its totient is φ = 546077952.

The previous prime is 561706619. The next prime is 561706693. The reversal of 561706657 is 756607165.

It can be written as a sum of positive squares in 4 ways, for example, as 283450896 + 278255761 = 16836^2 + 16681^2 .

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 561706657 - 2¹¹ = 561704609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561706697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45273 + ... + 56329.

It is an arithmetic number, because the mean of its divisors is an integer number (72170037).

Almost surely, 2^561706657 is an apocalyptic number.

It is an amenable number.

561706657 is a deficient number, since it is larger than the sum of its proper divisors (15653639).

561706657 is a wasteful number, since it uses less digits than its factorization.

561706657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12467.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 561706657 is about 23700.3514108968. The cubic root of 561706657 is about 825.0935465396.

The spelling of 561706657 in words is "five hundred sixty-one million, seven hundred six thousand, six hundred fifty-seven".