505636165 has 8 divisors (see below), whose sum is σ = 618212088. Its totient is φ = 396876480.

The previous prime is 505636139. The next prime is 505636169. The reversal of 505636165 is 561636505.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 263802564 + 241833601 = 16242^2 + 15551^2 .

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

It is not a de Polignac number, because 505636165 - 2⁹ = 505635653 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505636169) 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, 953766 + ... + 954295.

It is an arithmetic number, because the mean of its divisors is an integer number (77276511).

Almost surely, 2^505636165 is an apocalyptic number.

It is an amenable number.

505636165 is a deficient number, since it is larger than the sum of its proper divisors (112575923).

505636165 is a wasteful number, since it uses less digits than its factorization.

505636165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908119.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 505636165 is about 22486.3550848064. The cubic root of 505636165 is about 796.6716746202.

The spelling of 505636165 in words is "five hundred five million, six hundred thirty-six thousand, one hundred sixty-five".