505116665 has 8 divisors (see below), whose sum is σ = 641795400. Its totient is φ = 380323072.

The previous prime is 505116607. The next prime is 505116673. The reversal of 505116665 is 566611505.

It can be written as a sum of positive squares in 4 ways, for example, as 88303609 + 416813056 = 9397^2 + 20416^2 .

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 505116665 - 2¹⁰ = 505115641 is a prime.

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, 2971190 + ... + 2971359.

It is an arithmetic number, because the mean of its divisors is an integer number (80224425).

Almost surely, 2^505116665 is an apocalyptic number.

It is an amenable number.

505116665 is a deficient number, since it is larger than the sum of its proper divisors (136678735).

505116665 is a wasteful number, since it uses less digits than its factorization.

505116665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942571.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 505116665 is about 22474.8006665243. The cubic root of 505116665 is about 796.3987426953.

The spelling of 505116665 in words is "five hundred five million, one hundred sixteen thousand, six hundred sixty-five".