611556010661 has 2 divisors, whose sum is σ = 611556010662. Its totient is φ = 611556010660.

The previous prime is 611556010651. The next prime is 611556010679. The reversal of 611556010661 is 166010655116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602632374436 + 8923636225 = 776294^2 + 94465^2 .

It is a cyclic number.

It is not a de Polignac number, because 611556010661 - 2¹⁴ = 611555994277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611556010601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305778005330 + 305778005331.

It is an arithmetic number, because the mean of its divisors is an integer number (305778005331).

Almost surely, 2^611556010661 is an apocalyptic number.

It is an amenable number.

611556010661 is a deficient number, since it is larger than the sum of its proper divisors (1).

611556010661 is an equidigital number, since it uses as much as digits as its factorization.

611556010661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

Adding to 611556010661 its reverse (166010655116), we get a palindrome (777566665777).

The spelling of 611556010661 in words is "six hundred eleven billion, five hundred fifty-six million, ten thousand, six hundred sixty-one".