661346017 has 2 divisors, whose sum is σ = 661346018. Its totient is φ = 661346016.

The previous prime is 661346009. The next prime is 661346039. The reversal of 661346017 is 710643166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348905041 + 312440976 = 18679^2 + 17676^2 .

It is a cyclic number.

It is not a de Polignac number, because 661346017 - 2³ = 661346009 is a prime.

It is not a weakly prime, because it can be changed into another prime (661346057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330673008 + 330673009.

It is an arithmetic number, because the mean of its divisors is an integer number (330673009).

Almost surely, 2^661346017 is an apocalyptic number.

It is an amenable number.

661346017 is a deficient number, since it is larger than the sum of its proper divisors (1).

661346017 is an equidigital number, since it uses as much as digits as its factorization.

661346017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 661346017 is about 25716.6486346880. The cubic root of 661346017 is about 871.2502467567.

The spelling of 661346017 in words is "six hundred sixty-one million, three hundred forty-six thousand, seventeen".