645543512 has 16 divisors (see below), whose sum is σ = 1210839840. Its totient is φ = 322652896.

The previous prime is 645543511. The next prime is 645543517. The reversal of 645543512 is 215345546.

645543512 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 (645543511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10838 + ... + 37530.

It is an arithmetic number, because the mean of its divisors is an integer number (75677490).

Almost surely, 2^645543512 is an apocalyptic number.

It is an amenable number.

645543512 is a deficient number, since it is larger than the sum of its proper divisors (565296328).

645543512 is a wasteful number, since it uses less digits than its factorization.

645543512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29722 (or 29718 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The square root of 645543512 is about 25407.5483272196. The cubic root of 645543512 is about 864.2548795072.

The spelling of 645543512 in words is "six hundred forty-five million, five hundred forty-three thousand, five hundred twelve".