645117107 has 2 divisors, whose sum is σ = 645117108. Its totient is φ = 645117106.

The previous prime is 645117103. The next prime is 645117169. The reversal of 645117107 is 701711546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645117107 - 2² = 645117103 is a prime.

It is not a weakly prime, because it can be changed into another prime (645117103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322558553 + 322558554.

It is an arithmetic number, because the mean of its divisors is an integer number (322558554).

Almost surely, 2^645117107 is an apocalyptic number.

645117107 is a deficient number, since it is larger than the sum of its proper divisors (1).

645117107 is an equidigital number, since it uses as much as digits as its factorization.

645117107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 645117107 is about 25399.1556355718. The cubic root of 645117107 is about 864.0645469860.

The spelling of 645117107 in words is "six hundred forty-five million, one hundred seventeen thousand, one hundred seven".