645160247 has 2 divisors, whose sum is σ = 645160248. Its totient is φ = 645160246.

The previous prime is 645160237. The next prime is 645160253. The reversal of 645160247 is 742061546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645160247 - 2¹⁸ = 644898103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645160237) 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, 322580123 + 322580124.

It is an arithmetic number, because the mean of its divisors is an integer number (322580124).

Almost surely, 2^645160247 is an apocalyptic number.

645160247 is a deficient number, since it is larger than the sum of its proper divisors (1).

645160247 is an equidigital number, since it uses as much as digits as its factorization.

645160247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 645160247 is about 25400.0048622043. The cubic root of 645160247 is about 864.0838070104.

The spelling of 645160247 in words is "six hundred forty-five million, one hundred sixty thousand, two hundred forty-seven".