613236661 has 4 divisors (see below), whose sum is σ = 615868812. Its totient is φ = 610604512.

The previous prime is 613236653. The next prime is 613236671. The reversal of 613236661 is 166632316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77545636 + 535691025 = 8806^2 + 23145^2 .

It is a cyclic number.

It is not a de Polignac number, because 613236661 - 2³ = 613236653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613236601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1315726 + ... + 1316191.

It is an arithmetic number, because the mean of its divisors is an integer number (153967203).

Almost surely, 2^613236661 is an apocalyptic number.

It is an amenable number.

613236661 is a deficient number, since it is larger than the sum of its proper divisors (2632151).

613236661 is a wasteful number, since it uses less digits than its factorization.

613236661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632150.

The product of its digits is 23328, while the sum is 34.

The square root of 613236661 is about 24763.6156689608. The cubic root of 613236661 is about 849.5899572432.

Adding to 613236661 its reverse (166632316), we get a palindrome (779868977).

The spelling of 613236661 in words is "six hundred thirteen million, two hundred thirty-six thousand, six hundred sixty-one".