6570661 has 2 divisors, whose sum is σ = 6570662. Its totient is φ = 6570660.

The previous prime is 6570649. The next prime is 6570677. The reversal of 6570661 is 1660756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 93636 = 2545^2 + 306^2 .

It is a cyclic number.

It is not a de Polignac number, because 6570661 - 2⁹ = 6570149 is a prime.

It is equal to p₄₄₉₂₇₅ and since 6570661 and 449275 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6570601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3285330 + 3285331.

It is an arithmetic number, because the mean of its divisors is an integer number (3285331).

Almost surely, 2^6570661 is an apocalyptic number.

It is an amenable number.

6570661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6570661 is an equidigital number, since it uses as much as digits as its factorization.

6570661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 6570661 is about 2563.3300606828. The cubic root of 6570661 is about 187.2993860240.

The spelling of 6570661 in words is "six million, five hundred seventy thousand, six hundred sixty-one".