505043665 has 16 divisors (see below), whose sum is σ = 693105408. Its totient is φ = 346078656.

The previous prime is 505043663. The next prime is 505043677. The reversal of 505043665 is 566340505.

It is not a de Polignac number, because 505043665 - 2¹ = 505043663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505043665.

It is not an unprimeable number, because it can be changed into a prime (505043663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58359 + ... + 66451.

It is an arithmetic number, because the mean of its divisors is an integer number (43319088).

Almost surely, 2^505043665 is an apocalyptic number.

It is an amenable number.

505043665 is a deficient number, since it is larger than the sum of its proper divisors (188061743).

505043665 is a wasteful number, since it uses less digits than its factorization.

505043665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9888.

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 505043665 is about 22473.1765667429. The cubic root of 505043665 is about 796.3603753812.

The spelling of 505043665 in words is "five hundred five million, forty-three thousand, six hundred sixty-five".