661343202343163 has 2 divisors, whose sum is σ = 661343202343164. Its totient is φ = 661343202343162.

The previous prime is 661343202343133. The next prime is 661343202343199. The reversal of 661343202343163 is 361343202343166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661343202343163 is a prime.

It is a super-2 number, since 2×661343202343163² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661343202343133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330671601171581 + 330671601171582.

It is an arithmetic number, because the mean of its divisors is an integer number (330671601171582).

Almost surely, 2^{661343202343163} is an apocalyptic number.

661343202343163 is a deficient number, since it is larger than the sum of its proper divisors (1).

661343202343163 is an equidigital number, since it uses as much as digits as its factorization.

661343202343163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 47.

The spelling of 661343202343163 in words is "six hundred sixty-one trillion, three hundred forty-three billion, two hundred two million, three hundred forty-three thousand, one hundred sixty-three".