670565561 has 8 divisors (see below), whose sum is σ = 710237160. Its totient is φ = 630919168.

The previous prime is 670565513. The next prime is 670565573. The reversal of 670565561 is 165565076.

670565561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 457960000 + 212605561 = 21400^2 + 14581^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670565561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670565501) 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, 96905 + ... + 103593.

It is an arithmetic number, because the mean of its divisors is an integer number (88779645).

Almost surely, 2^670565561 is an apocalyptic number.

It is an amenable number.

670565561 is a deficient number, since it is larger than the sum of its proper divisors (39671599).

670565561 is a wasteful number, since it uses less digits than its factorization.

670565561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12603.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 670565561 is about 25895.2806704233. The cubic root of 670565561 is about 875.2801545364.

The spelling of 670565561 in words is "six hundred seventy million, five hundred sixty-five thousand, five hundred sixty-one".