613613260621 has 2 divisors, whose sum is σ = 613613260622. Its totient is φ = 613613260620.

The previous prime is 613613260537. The next prime is 613613260643. The reversal of 613613260621 is 126062316316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604018078596 + 9595182025 = 777186^2 + 97955^2 .

It is a cyclic number.

It is not a de Polignac number, because 613613260621 - 2⁹ = 613613260109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613613260721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306806630310 + 306806630311.

It is an arithmetic number, because the mean of its divisors is an integer number (306806630311).

Almost surely, 2^613613260621 is an apocalyptic number.

It is an amenable number.

613613260621 is a deficient number, since it is larger than the sum of its proper divisors (1).

613613260621 is an equidigital number, since it uses as much as digits as its factorization.

613613260621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

Adding to 613613260621 its reverse (126062316316), we get a palindrome (739675576937).

The spelling of 613613260621 in words is "six hundred thirteen billion, six hundred thirteen million, two hundred sixty thousand, six hundred twenty-one".