645135075 has 36 divisors (see below), whose sum is σ = 1244399520. Its totient is φ = 317603520.

The previous prime is 645135061. The next prime is 645135077. The reversal of 645135075 is 570531546.

645135075 is a `hidden beast` number, since 645 + 1 + 3 + 5 + 0 + 7 + 5 = 666.

It is not a de Polignac number, because 645135075 - 2⁴ = 645135059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645135077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 107355 + ... + 113204.

Almost surely, 2^645135075 is an apocalyptic number.

645135075 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

645135075 is a deficient number, since it is larger than the sum of its proper divisors (599264445).

645135075 is a wasteful number, since it uses less digits than its factorization.

645135075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220588 (or 220580 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 645135075 is about 25399.5093456547. The cubic root of 645135075 is about 864.0725689754.

The spelling of 645135075 in words is "six hundred forty-five million, one hundred thirty-five thousand, seventy-five".