645111674 has 32 divisors (see below), whose sum is σ = 1054771200. Its totient is φ = 294790320.

The previous prime is 645111647. The next prime is 645111679. The reversal of 645111674 is 476111546.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645111679) 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 15 ways as a sum of consecutive naturals, for example, 492929 + ... + 494235.

It is an arithmetic number, because the mean of its divisors is an integer number (32961600).

Almost surely, 2^645111674 is an apocalyptic number.

645111674 is a deficient number, since it is larger than the sum of its proper divisors (409659526).

645111674 is a wasteful number, since it uses less digits than its factorization.

645111674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778.

The product of its digits is 20160, while the sum is 35.

The square root of 645111674 is about 25399.0486829724. The cubic root of 645111674 is about 864.0621213407.

The spelling of 645111674 in words is "six hundred forty-five million, one hundred eleven thousand, six hundred seventy-four".