601560556661 has 2 divisors, whose sum is σ = 601560556662. Its totient is φ = 601560556660.

The previous prime is 601560556627. The next prime is 601560556669. The reversal of 601560556661 is 166655065106.

601560556661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593439122500 + 8121434161 = 770350^2 + 90119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-601560556661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (601560556669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300780278330 + 300780278331.

It is an arithmetic number, because the mean of its divisors is an integer number (300780278331).

Almost surely, 2^601560556661 is an apocalyptic number.

It is an amenable number.

601560556661 is a deficient number, since it is larger than the sum of its proper divisors (1).

601560556661 is an equidigital number, since it uses as much as digits as its factorization.

601560556661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 601560556661 in words is "six hundred one billion, five hundred sixty million, five hundred fifty-six thousand, six hundred sixty-one".