613612603216621 has 2 divisors, whose sum is σ = 613612603216622. Its totient is φ = 613612603216620.

The previous prime is 613612603216519. The next prime is 613612603216649. The reversal of 613612603216621 is 126612306216316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588241284586596 + 25371318630025 = 24253686^2 + 5036995^2 .

It is a cyclic number.

It is not a de Polignac number, because 613612603216621 - 2¹¹ = 613612603214573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613612603286621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306806301608310 + 306806301608311.

It is an arithmetic number, because the mean of its divisors is an integer number (306806301608311).

Almost surely, 2^{613612603216621} is an apocalyptic number.

It is an amenable number.

613612603216621 is a deficient number, since it is larger than the sum of its proper divisors (1).

613612603216621 is an equidigital number, since it uses as much as digits as its factorization.

613612603216621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 613612603216621 in words is "six hundred thirteen trillion, six hundred twelve billion, six hundred three million, two hundred sixteen thousand, six hundred twenty-one".