645160253 has 2 divisors, whose sum is σ = 645160254. Its totient is φ = 645160252.

The previous prime is 645160247. The next prime is 645160259. The reversal of 645160253 is 352061546.

It is a balanced prime because it is at equal distance from previous prime (645160247) and next prime (645160259).

It can be written as a sum of positive squares in only one way, i.e., 608460889 + 36699364 = 24667^2 + 6058^2 .

It is a cyclic number.

It is not a de Polignac number, because 645160253 - 2⁴ = 645160237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645160259) 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, 322580126 + 322580127.

It is an arithmetic number, because the mean of its divisors is an integer number (322580127).

Almost surely, 2^645160253 is an apocalyptic number.

It is an amenable number.

645160253 is a deficient number, since it is larger than the sum of its proper divisors (1).

645160253 is an equidigital number, since it uses as much as digits as its factorization.

645160253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 645160253 is about 25400.0049803145. The cubic root of 645160253 is about 864.0838096891.

The spelling of 645160253 in words is "six hundred forty-five million, one hundred sixty thousand, two hundred fifty-three".