640120215303 has 24 divisors (see below), whose sum is σ = 944565343488. Its totient is φ = 417545664912.

The previous prime is 640120215271. The next prime is 640120215311. The reversal of 640120215303 is 303512021046.

640120215303 is a `hidden beast` number, since 6 + 4 + 0 + 120 + 2 + 1 + 530 + 3 = 666.

It is not a de Polignac number, because 640120215303 - 2⁵ = 640120215271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640120215313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1248300 + ... + 1684782.

It is an arithmetic number, because the mean of its divisors is an integer number (39356889312).

Almost surely, 2^640120215303 is an apocalyptic number.

640120215303 is a deficient number, since it is larger than the sum of its proper divisors (304445128185).

640120215303 is a wasteful number, since it uses less digits than its factorization.

640120215303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440003 (or 440000 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 640120215303 its reverse (303512021046), we get a palindrome (943632236349).

The spelling of 640120215303 in words is "six hundred forty billion, one hundred twenty million, two hundred fifteen thousand, three hundred three".