645313543 has 16 divisors (see below), whose sum is σ = 750772224. Its totient is φ = 543261600.

The previous prime is 645313519. The next prime is 645313547. The reversal of 645313543 is 345313546.

645313543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645313543 - 2¹³ = 645305351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645313499 and 645313508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645313547) 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, 86196 + ... + 93382.

It is an arithmetic number, because the mean of its divisors is an integer number (46923264).

Almost surely, 2^645313543 is an apocalyptic number.

645313543 is a deficient number, since it is larger than the sum of its proper divisors (105458681).

645313543 is a wasteful number, since it uses less digits than its factorization.

645313543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7422.

The product of its digits is 64800, while the sum is 34.

The square root of 645313543 is about 25403.0223201886. The cubic root of 645313543 is about 864.1522396735.

The spelling of 645313543 in words is "six hundred forty-five million, three hundred thirteen thousand, five hundred forty-three".