646420207 has 2 divisors, whose sum is σ = 646420208. Its totient is φ = 646420206.

The previous prime is 646420169. The next prime is 646420231. The reversal of 646420207 is 702024646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646420207 - 2⁷ = 646420079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646420507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323210103 + 323210104.

It is an arithmetic number, because the mean of its divisors is an integer number (323210104).

Almost surely, 2^646420207 is an apocalyptic number.

646420207 is a deficient number, since it is larger than the sum of its proper divisors (1).

646420207 is an equidigital number, since it uses as much as digits as its factorization.

646420207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 646420207 is about 25424.7951220851. The cubic root of 646420207 is about 864.6459428400.

The spelling of 646420207 in words is "six hundred forty-six million, four hundred twenty thousand, two hundred seven".