613661605 has 16 divisors (see below), whose sum is σ = 765154800. Its totient is φ = 471905280.

The previous prime is 613661603. The next prime is 613661611. The reversal of 613661605 is 506166316.

It can be written as a sum of positive squares in 8 ways, for example, as 128913316 + 484748289 = 11354^2 + 22017^2 .

It is not a de Polignac number, because 613661605 - 2¹ = 613661603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613661603) 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, 23965 + ... + 42445.

It is an arithmetic number, because the mean of its divisors is an integer number (47822175).

Almost surely, 2^613661605 is an apocalyptic number.

It is an amenable number.

613661605 is a deficient number, since it is larger than the sum of its proper divisors (151493195).

613661605 is a wasteful number, since it uses less digits than its factorization.

613661605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18744.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 613661605 is about 24772.1941902610. The cubic root of 613661605 is about 849.7861538167.

The spelling of 613661605 in words is "six hundred thirteen million, six hundred sixty-one thousand, six hundred five".