504856661 has 2 divisors, whose sum is σ = 504856662. Its totient is φ = 504856660.

The previous prime is 504856549. The next prime is 504856673. The reversal of 504856661 is 166658405.

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., 372721636 + 132135025 = 19306^2 + 11495^2 .

It is a cyclic number.

It is not a de Polignac number, because 504856661 - 2²⁶ = 437747797 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 (504859661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252428330 + 252428331.

It is an arithmetic number, because the mean of its divisors is an integer number (252428331).

Almost surely, 2^504856661 is an apocalyptic number.

It is an amenable number.

504856661 is a deficient number, since it is larger than the sum of its proper divisors (1).

504856661 is an equidigital number, since it uses as much as digits as its factorization.

504856661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 504856661 is about 22469.0155770118. The cubic root of 504856661 is about 796.2620730162.

The spelling of 504856661 in words is "five hundred four million, eight hundred fifty-six thousand, six hundred sixty-one".