661204593911473 has 2 divisors, whose sum is σ = 661204593911474. Its totient is φ = 661204593911472.

The previous prime is 661204593911401. The next prime is 661204593911531. The reversal of 661204593911473 is 374119395402166.

It is a happy number.

661204593911473 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., 651884658049024 + 9319935862449 = 25532032^2 + 3052857^2 .

It is a cyclic number.

It is not a de Polignac number, because 661204593911473 - 2⁹ = 661204593910961 is a prime.

It is a super-2 number, since 2×661204593911473² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661204593911573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330602296955736 + 330602296955737.

It is an arithmetic number, because the mean of its divisors is an integer number (330602296955737).

Almost surely, 2^{661204593911473} is an apocalyptic number.

It is an amenable number.

661204593911473 is a deficient number, since it is larger than the sum of its proper divisors (1).

661204593911473 is an equidigital number, since it uses as much as digits as its factorization.

661204593911473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 661204593911473 in words is "six hundred sixty-one trillion, two hundred four billion, five hundred ninety-three million, nine hundred eleven thousand, four hundred seventy-three".