645635232140 has 24 divisors (see below), whose sum is σ = 1360624932240. Its totient is φ = 257341531968.

The previous prime is 645635232133. The next prime is 645635232157. The reversal of 645635232140 is 41232536546.

645635232140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57029255 + ... + 57040574.

It is an arithmetic number, because the mean of its divisors is an integer number (56692705510).

Almost surely, 2^645635232140 is an apocalyptic number.

It is an amenable number.

645635232140 is an abundant number, since it is smaller than the sum of its proper divisors (714989700100).

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

645635232140 is a wasteful number, since it uses less digits than its factorization.

645635232140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114070121 (or 114070119 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

Adding to 645635232140 its reverse (41232536546), we get a palindrome (686867768686).

The spelling of 645635232140 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred thirty-two thousand, one hundred forty".