505504661 has 2 divisors, whose sum is σ = 505504662. Its totient is φ = 505504660.

The previous prime is 505504627. The next prime is 505504679. The reversal of 505504661 is 166405505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415140625 + 90364036 = 20375^2 + 9506^2 .

It is a cyclic number.

It is not a de Polignac number, because 505504661 - 2²² = 501310357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505504691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252752330 + 252752331.

It is an arithmetic number, because the mean of its divisors is an integer number (252752331).

Almost surely, 2^505504661 is an apocalyptic number.

It is an amenable number.

505504661 is a deficient number, since it is larger than the sum of its proper divisors (1).

505504661 is an equidigital number, since it uses as much as digits as its factorization.

505504661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 505504661 is about 22483.4308102656. The cubic root of 505504661 is about 796.6026034825.

The spelling of 505504661 in words is "five hundred five million, five hundred four thousand, six hundred sixty-one".