646006169 has 2 divisors, whose sum is σ = 646006170. Its totient is φ = 646006168.

The previous prime is 646006139. The next prime is 646006183. The reversal of 646006169 is 961600646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362521600 + 283484569 = 19040^2 + 16837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646006169 is a prime.

It is a super-2 number, since 2×646006169² = 834647940772113122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646006139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323003084 + 323003085.

It is an arithmetic number, because the mean of its divisors is an integer number (323003085).

Almost surely, 2^646006169 is an apocalyptic number.

It is an amenable number.

646006169 is a deficient number, since it is larger than the sum of its proper divisors (1).

646006169 is an equidigital number, since it uses as much as digits as its factorization.

646006169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 646006169 is about 25416.6514120173. The cubic root of 646006169 is about 864.4612988919.

The spelling of 646006169 in words is "six hundred forty-six million, six thousand, one hundred sixty-nine".