645845487742 has 24 divisors (see below), whose sum is σ = 1213621743096. Its totient is φ = 255499313328.

The previous prime is 645845487719. The next prime is 645845487743. The reversal of 645845487742 is 247784548546.

645845487742 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 (645845487743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253470268 + ... + 253472815.

It is an arithmetic number, because the mean of its divisors is an integer number (50567572629).

Almost surely, 2^645845487742 is an apocalyptic number.

645845487742 is a deficient number, since it is larger than the sum of its proper divisors (567776255354).

645845487742 is a wasteful number, since it uses less digits than its factorization.

645845487742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506943112 (or 506943105 counting only the distinct ones).

The product of its digits is 240844800, while the sum is 64.

The spelling of 645845487742 in words is "six hundred forty-five billion, eight hundred forty-five million, four hundred eighty-seven thousand, seven hundred forty-two".