646564147 has 2 divisors, whose sum is σ = 646564148. Its totient is φ = 646564146.

The previous prime is 646564133. The next prime is 646564153. The reversal of 646564147 is 741465646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646564147 - 2¹⁹ = 646039859 is a prime.

It is not a weakly prime, because it can be changed into another prime (646564187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323282073 + 323282074.

It is an arithmetic number, because the mean of its divisors is an integer number (323282074).

Almost surely, 2^646564147 is an apocalyptic number.

646564147 is a deficient number, since it is larger than the sum of its proper divisors (1).

646564147 is an equidigital number, since it uses as much as digits as its factorization.

646564147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 43.

The square root of 646564147 is about 25427.6256657990. The cubic root of 646564147 is about 864.7101157000.

The spelling of 646564147 in words is "six hundred forty-six million, five hundred sixty-four thousand, one hundred forty-seven".