613612603216521 has 12 divisors (see below), whose sum is σ = 919156327452272. Its totient is φ = 409075068810852.

The previous prime is 613612603216519. The next prime is 613612603216621. The reversal of 613612603216521 is 125612306216316.

It is a happy number.

613612603216521 is a `hidden beast` number, since 6 + 1 + 3 + 6 + 1 + 2 + 603 + 2 + 16 + 5 + 21 = 666.

It is not a de Polignac number, because 613612603216521 - 2¹ = 613612603216519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613612603216621) 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 in 11 ways as a sum of consecutive naturals, for example, 1262577372631 + ... + 1262577373116.

Almost surely, 2^{613612603216521} is an apocalyptic number.

It is an amenable number.

613612603216521 is a deficient number, since it is larger than the sum of its proper divisors (305543724235751).

613612603216521 is an equidigital number, since it uses as much as digits as its factorization.

613612603216521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525154745762 (or 2525154745750 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 613612603216521 in words is "six hundred thirteen trillion, six hundred twelve billion, six hundred three million, two hundred sixteen thousand, five hundred twenty-one".