645645042200 has 24 divisors (see below), whose sum is σ = 1501124723580. Its totient is φ = 258258016800.

The previous prime is 645645042151. The next prime is 645645042241. The reversal of 645645042200 is 2240546546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1614112406 + ... + 1614112805.

Almost surely, 2^645645042200 is an apocalyptic number.

It is an amenable number.

645645042200 is an abundant number, since it is smaller than the sum of its proper divisors (855479681380).

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

645645042200 is a wasteful number, since it uses less digits than its factorization.

645645042200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228225227 (or 3228225218 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 645645042200 its reverse (2240546546), we get a palindrome (647885588746).

The spelling of 645645042200 in words is "six hundred forty-five billion, six hundred forty-five million, forty-two thousand, two hundred".