505644663 has 8 divisors (see below), whose sum is σ = 709676800. Its totient is φ = 319354488.

The previous prime is 505644653. The next prime is 505644703. The reversal of 505644663 is 366446505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 505644663 - 2⁵ = 505644631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505644653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4435423 + ... + 4435536.

It is an arithmetic number, because the mean of its divisors is an integer number (88709600).

Almost surely, 2^505644663 is an apocalyptic number.

505644663 is a deficient number, since it is larger than the sum of its proper divisors (204032137).

505644663 is a wasteful number, since it uses less digits than its factorization.

505644663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870981.

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 505644663 is about 22486.5440430494. The cubic root of 505644663 is about 796.6761376962.

The spelling of 505644663 in words is "five hundred five million, six hundred forty-four thousand, six hundred sixty-three".