645038004050 has 48 divisors (see below), whose sum is σ = 1351061455104. Its totient is φ = 226992840000.

The previous prime is 645038004043. The next prime is 645038004059. The reversal of 645038004050 is 50400830546.

645038004050 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 self number, because there is not a number n which added to its sum of digits gives 645038004050.

It is not an unprimeable number, because it can be changed into a prime (645038004059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18899021 + ... + 18933120.

It is an arithmetic number, because the mean of its divisors is an integer number (28147113648).

Almost surely, 2^645038004050 is an apocalyptic number.

645038004050 is an abundant number, since it is smaller than the sum of its proper divisors (706023451054).

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

645038004050 is a wasteful number, since it uses less digits than its factorization.

645038004050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37832195 (or 37832190 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 645038004050 its reverse (50400830546), we get a palindrome (695438834596).

The spelling of 645038004050 in words is "six hundred forty-five billion, thirty-eight million, four thousand, fifty".