645445718 has 16 divisors (see below), whose sum is σ = 977747760. Its totient is φ = 319545600.

The previous prime is 645445709. The next prime is 645445729. The reversal of 645445718 is 817544546.

645445718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82538 + ... + 90018.

It is an arithmetic number, because the mean of its divisors is an integer number (61109235).

Almost surely, 2^645445718 is an apocalyptic number.

645445718 is a deficient number, since it is larger than the sum of its proper divisors (332302042).

645445718 is a wasteful number, since it uses less digits than its factorization.

645445718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903.

The product of its digits is 537600, while the sum is 44.

The square root of 645445718 is about 25405.6237475091. The cubic root of 645445718 is about 864.2112350390.

The spelling of 645445718 in words is "six hundred forty-five million, four hundred forty-five thousand, seven hundred eighteen".