408550661 has 2 divisors, whose sum is σ = 408550662. Its totient is φ = 408550660.

The previous prime is 408550627. The next prime is 408550669. The reversal of 408550661 is 166055804.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269452225 + 139098436 = 16415^2 + 11794^2 .

It is a cyclic number.

It is not a de Polignac number, because 408550661 - 2¹⁴ = 408534277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408550669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204275330 + 204275331.

It is an arithmetic number, because the mean of its divisors is an integer number (204275331).

Almost surely, 2^408550661 is an apocalyptic number.

It is an amenable number.

408550661 is a deficient number, since it is larger than the sum of its proper divisors (1).

408550661 is an equidigital number, since it uses as much as digits as its factorization.

408550661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 408550661 is about 20212.6361714646. The cubic root of 408550661 is about 742.0194783019.

The spelling of 408550661 in words is "four hundred eight million, five hundred fifty thousand, six hundred sixty-one".