500661605 has 8 divisors (see below), whose sum is σ = 604827000. Its totient is φ = 397840576.

The previous prime is 500661593. The next prime is 500661607. The reversal of 500661605 is 506166005.

It can be written as a sum of positive squares in 4 ways, for example, as 289444 + 500372161 = 538^2 + 22369^2 .

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 500661605 - 2¹⁴ = 500645221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500661607) 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, 335270 + ... + 336759.

It is an arithmetic number, because the mean of its divisors is an integer number (75603375).

Almost surely, 2^500661605 is an apocalyptic number.

It is an amenable number.

500661605 is a deficient number, since it is larger than the sum of its proper divisors (104165395).

500661605 is a wasteful number, since it uses less digits than its factorization.

500661605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672183.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 500661605 is about 22375.4688219040. The cubic root of 500661605 is about 794.0504491798.

The spelling of 500661605 in words is "five hundred million, six hundred sixty-one thousand, six hundred five".