613624603661 has 2 divisors, whose sum is σ = 613624603662. Its totient is φ = 613624603660.

The previous prime is 613624603619. The next prime is 613624603667. The reversal of 613624603661 is 166306426316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527954826025 + 85669777636 = 726605^2 + 292694^2 .

It is a cyclic number.

It is not a de Polignac number, because 613624603661 - 2³⁰ = 612550861837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613624603667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306812301830 + 306812301831.

It is an arithmetic number, because the mean of its divisors is an integer number (306812301831).

Almost surely, 2^613624603661 is an apocalyptic number.

It is an amenable number.

613624603661 is a deficient number, since it is larger than the sum of its proper divisors (1).

613624603661 is an equidigital number, since it uses as much as digits as its factorization.

613624603661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 613624603661 in words is "six hundred thirteen billion, six hundred twenty-four million, six hundred three thousand, six hundred sixty-one".