645525546 has 32 divisors (see below), whose sum is σ = 1342765248. Its totient is φ = 206720640.

The previous prime is 645525541. The next prime is 645525557.

It is a happy number.

645525546 is nontrivially palindromic in base 10.

645525546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645525498 and 645525507.

It is not an unprimeable number, because it can be changed into a prime (645525541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4771 + ... + 36246.

It is an arithmetic number, because the mean of its divisors is an integer number (41961414).

Almost surely, 2^645525546 is an apocalyptic number.

645525546 is an abundant number, since it is smaller than the sum of its proper divisors (697239702).

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

645525546 is a wasteful number, since it uses less digits than its factorization.

645525546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41126.

The product of its digits is 720000, while the sum is 42.

The square root of 645525546 is about 25407.1947684116. The cubic root of 645525546 is about 864.2468617945.

The spelling of 645525546 in words is "six hundred forty-five million, five hundred twenty-five thousand, five hundred forty-six".