640520013330 has 96 divisors (see below), whose sum is σ = 1722314880000. Its totient is φ = 165055003776.

The previous prime is 640520013299. The next prime is 640520013337. The reversal of 640520013330 is 33310025046.

It is a happy number.

640520013330 is a `hidden beast` number, since 6 + 4 + 0 + 520 + 0 + 133 + 3 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 640520013294 and 640520013303.

It is not an unprimeable number, because it can be changed into a prime (640520013337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 624205 + ... + 1292544.

It is an arithmetic number, because the mean of its divisors is an integer number (17940780000).

Almost surely, 2^640520013330 is an apocalyptic number.

640520013330 is an abundant number, since it is smaller than the sum of its proper divisors (1081794866670).

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

640520013330 is a wasteful number, since it uses less digits than its factorization.

640520013330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916888 (or 1916885 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 640520013330 its reverse (33310025046), we get a palindrome (673830038376).

The spelling of 640520013330 in words is "six hundred forty billion, five hundred twenty million, thirteen thousand, three hundred thirty".