510006661 has 2 divisors, whose sum is σ = 510006662. Its totient is φ = 510006660.

The previous prime is 510006643. The next prime is 510006677. The reversal of 510006661 is 166600015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401200900 + 108805761 = 20030^2 + 10431^2 .

It is a cyclic number.

It is not a de Polignac number, because 510006661 - 2¹⁷ = 509875589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (510006691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255003330 + 255003331.

It is an arithmetic number, because the mean of its divisors is an integer number (255003331).

Almost surely, 2^510006661 is an apocalyptic number.

It is an amenable number.

510006661 is a deficient number, since it is larger than the sum of its proper divisors (1).

510006661 is an equidigital number, since it uses as much as digits as its factorization.

510006661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 510006661 is about 22583.3270578097. The cubic root of 510006661 is about 798.9604523652.

Adding to 510006661 its reverse (166600015), we get a palindrome (676606676).

The spelling of 510006661 in words is "five hundred ten million, six thousand, six hundred sixty-one".