645474017 has 2 divisors, whose sum is σ = 645474018. Its totient is φ = 645474016.

The previous prime is 645474007. The next prime is 645474043. The reversal of 645474017 is 710474546.

It is a happy number.

645474017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645109201 + 364816 = 25399^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 645474017 - 2¹⁶ = 645408481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645474007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322737008 + 322737009.

It is an arithmetic number, because the mean of its divisors is an integer number (322737009).

Almost surely, 2^645474017 is an apocalyptic number.

It is an amenable number.

645474017 is a deficient number, since it is larger than the sum of its proper divisors (1).

645474017 is an equidigital number, since it uses as much as digits as its factorization.

645474017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 645474017 is about 25406.1806850223. The cubic root of 645474017 is about 864.2238650483.

The spelling of 645474017 in words is "six hundred forty-five million, four hundred seventy-four thousand, seventeen".