640228125009 has 48 divisors (see below), whose sum is σ = 962099511296. Its totient is φ = 378210682080.

The previous prime is 640228124933. The next prime is 640228125029. The reversal of 640228125009 is 900521822046.

It is not a de Polignac number, because 640228125009 - 2³¹ = 638080641361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (640228125029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7559472 + ... + 7643694.

Almost surely, 2^640228125009 is an apocalyptic number.

It is an amenable number.

640228125009 is a deficient number, since it is larger than the sum of its proper divisors (321871386287).

640228125009 is a wasteful number, since it uses less digits than its factorization.

640228125009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84778 (or 84767 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 640228125009 in words is "six hundred forty billion, two hundred twenty-eight million, one hundred twenty-five thousand, nine".