640660120211 has 8 divisors (see below), whose sum is σ = 644419471200. Its totient is φ = 636906169152.

The previous prime is 640660120183. The next prime is 640660120223. The reversal of 640660120211 is 112021066046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640660120211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640660120271) 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 7 ways as a sum of consecutive naturals, for example, 1111880 + ... + 1586693.

It is an arithmetic number, because the mean of its divisors is an integer number (80552433900).

Almost surely, 2^640660120211 is an apocalyptic number.

640660120211 is a deficient number, since it is larger than the sum of its proper divisors (3759350989).

640660120211 is a wasteful number, since it uses less digits than its factorization.

640660120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699965.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 640660120211 its reverse (112021066046), we get a palindrome (752681186257).

The spelling of 640660120211 in words is "six hundred forty billion, six hundred sixty million, one hundred twenty thousand, two hundred eleven".