504557661 has 4 divisors (see below), whose sum is σ = 672743552. Its totient is φ = 336371772.

The previous prime is 504557639. The next prime is 504557707. The reversal of 504557661 is 166755405.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 504557661 - 2⁹ = 504557149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (504557561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84092941 + ... + 84092946.

It is an arithmetic number, because the mean of its divisors is an integer number (168185888).

Almost surely, 2^504557661 is an apocalyptic number.

It is an amenable number.

504557661 is a deficient number, since it is larger than the sum of its proper divisors (168185891).

504557661 is a wasteful number, since it uses less digits than its factorization.

504557661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168185890.

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 504557661 is about 22462.3609845448. The cubic root of 504557661 is about 796.1048472827.

The spelling of 504557661 in words is "five hundred four million, five hundred fifty-seven thousand, six hundred sixty-one".