645160065 has 32 divisors (see below), whose sum is σ = 1162432512. Its totient is φ = 302712000.

The previous prime is 645160039. The next prime is 645160069. The reversal of 645160065 is 560061546.

It is not a de Polignac number, because 645160065 - 2¹³ = 645151873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (645160069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57951 + ... + 68180.

It is an arithmetic number, because the mean of its divisors is an integer number (36326016).

Almost surely, 2^645160065 is an apocalyptic number.

It is an amenable number.

645160065 is a deficient number, since it is larger than the sum of its proper divisors (517272447).

645160065 is a wasteful number, since it uses less digits than its factorization.

645160065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126181.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 645160065 is about 25400.0012795275. The cubic root of 645160065 is about 864.0837257576.

The spelling of 645160065 in words is "six hundred forty-five million, one hundred sixty thousand, sixty-five".