505656665 has 8 divisors (see below), whose sum is σ = 607347720. Its totient is φ = 404152192.

The previous prime is 505656659. The next prime is 505656713. The reversal of 505656665 is 566656505.

It can be written as a sum of positive squares in 4 ways, for example, as 26790976 + 478865689 = 5176^2 + 21883^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 505656665 - 2¹⁰ = 505655641 is a prime.

It is a super-3 number, since 3×505656665³ (a number of 27 digits) contains 333 as substring.

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, 40610 + ... + 51579.

It is an arithmetic number, because the mean of its divisors is an integer number (75918465).

Almost surely, 2^505656665 is an apocalyptic number.

It is an amenable number.

505656665 is a deficient number, since it is larger than the sum of its proper divisors (101691055).

505656665 is a wasteful number, since it uses less digits than its factorization.

505656665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93291.

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 505656665 is about 22486.8109121769. The cubic root of 505656665 is about 796.6824409576.

The spelling of 505656665 in words is "five hundred five million, six hundred fifty-six thousand, six hundred sixty-five".