505308665 has 8 divisors (see below), whose sum is σ = 610387008. Its totient is φ = 401569200.

The previous prime is 505308659. The next prime is 505308709. The reversal of 505308665 is 566803505.

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

It is not a de Polignac number, because 505308665 - 2²⁰ = 504260089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333887 + ... + 335396.

It is an arithmetic number, because the mean of its divisors is an integer number (76298376).

Almost surely, 2^505308665 is an apocalyptic number.

It is an amenable number.

505308665 is a deficient number, since it is larger than the sum of its proper divisors (105078343).

505308665 is a wasteful number, since it uses less digits than its factorization.

505308665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669439.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 505308665 is about 22479.0717112607. The cubic root of 505308665 is about 796.4996363430.

It can be divided in two parts, 50530 and 8665, that added together give a palindrome (59195).

The spelling of 505308665 in words is "five hundred five million, three hundred eight thousand, six hundred sixty-five".