645800347 has 2 divisors, whose sum is σ = 645800348. Its totient is φ = 645800346.

The previous prime is 645800321. The next prime is 645800447. The reversal of 645800347 is 743008546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645800347 - 2¹¹ = 645798299 is a prime.

It is a Chen prime.

It is equal to p_33586372 and since 645800347 and 33586372 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (645800147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322900173 + 322900174.

It is an arithmetic number, because the mean of its divisors is an integer number (322900174).

Almost surely, 2^645800347 is an apocalyptic number.

645800347 is a deficient number, since it is larger than the sum of its proper divisors (1).

645800347 is an equidigital number, since it uses as much as digits as its factorization.

645800347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 645800347 is about 25412.6021296521. The cubic root of 645800347 is about 864.3694813720.

The spelling of 645800347 in words is "six hundred forty-five million, eight hundred thousand, three hundred forty-seven".