645695118 has 48 divisors (see below), whose sum is σ = 1466327760. Its totient is φ = 210613392.

The previous prime is 645695117. The next prime is 645695137. The reversal of 645695118 is 811596546.

645695118 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 not an unprimeable number, because it can be changed into a prime (645695117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116580 + ... + 121992.

It is an arithmetic number, because the mean of its divisors is an integer number (30548495).

Almost surely, 2^645695118 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645695118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733163880).

645695118 is an abundant number, since it is smaller than the sum of its proper divisors (820632642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645695118 is a wasteful number, since it uses less digits than its factorization.

645695118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5518 (or 5465 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 645695118 is about 25410.5316355247. The cubic root of 645695118 is about 864.3225310117.

The spelling of 645695118 in words is "six hundred forty-five million, six hundred ninety-five thousand, one hundred eighteen".