645464545 has 8 divisors (see below), whose sum is σ = 844971840. Its totient is φ = 469428720.

The previous prime is 645464527. The next prime is 645464549. The reversal of 645464545 is 545464546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645464545 - 2¹¹ = 645462497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645464549) 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 7 ways as a sum of consecutive naturals, for example, 5867805 + ... + 5867914.

It is an arithmetic number, because the mean of its divisors is an integer number (105621480).

Almost surely, 2^645464545 is an apocalyptic number.

It is an amenable number.

645464545 is a deficient number, since it is larger than the sum of its proper divisors (199507295).

645464545 is a wasteful number, since it uses less digits than its factorization.

645464545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11735735.

The product of its digits is 1152000, while the sum is 43.

The square root of 645464545 is about 25405.9942730057. The cubic root of 645464545 is about 864.2196376803.

Subtracting from 645464545 its reverse (545464546), we obtain a palindrome (99999999).

The spelling of 645464545 in words is "six hundred forty-five million, four hundred sixty-four thousand, five hundred forty-five".