646204147 has 2 divisors, whose sum is σ = 646204148. Its totient is φ = 646204146.

The previous prime is 646204133. The next prime is 646204177. The reversal of 646204147 is 741402646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646204147 - 2⁷ = 646204019 is a prime.

It is not a weakly prime, because it can be changed into another prime (646204177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323102073 + 323102074.

It is an arithmetic number, because the mean of its divisors is an integer number (323102074).

Almost surely, 2^646204147 is an apocalyptic number.

646204147 is a deficient number, since it is larger than the sum of its proper divisors (1).

646204147 is an equidigital number, since it uses as much as digits as its factorization.

646204147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 646204147 is about 25420.5457651877. The cubic root of 646204147 is about 864.5495987911.

The spelling of 646204147 in words is "six hundred forty-six million, two hundred four thousand, one hundred forty-seven".