646076173 has 2 divisors, whose sum is σ = 646076174. Its totient is φ = 646076172.

The previous prime is 646076159. The next prime is 646076183. The reversal of 646076173 is 371670646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639735849 + 6340324 = 25293^2 + 2518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646076173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646076113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323038086 + 323038087.

It is an arithmetic number, because the mean of its divisors is an integer number (323038087).

Almost surely, 2^646076173 is an apocalyptic number.

It is an amenable number.

646076173 is a deficient number, since it is larger than the sum of its proper divisors (1).

646076173 is an equidigital number, since it uses as much as digits as its factorization.

646076173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 646076173 is about 25418.0285034068. The cubic root of 646076173 is about 864.4925233424.

The spelling of 646076173 in words is "six hundred forty-six million, seventy-six thousand, one hundred seventy-three".