640520013311 has 8 divisors (see below), whose sum is σ = 642923661744. Its totient is φ = 638119694080.

The previous prime is 640520013299. The next prime is 640520013337. The reversal of 640520013311 is 113310025046.

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

It is a cyclic number.

It is not a de Polignac number, because 640520013311 - 2⁶ = 640520013247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640520013611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446456 + ... + 1216701.

It is an arithmetic number, because the mean of its divisors is an integer number (80365457718).

Almost surely, 2^640520013311 is an apocalyptic number.

640520013311 is a deficient number, since it is larger than the sum of its proper divisors (2403648433).

640520013311 is a wasteful number, since it uses less digits than its factorization.

640520013311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664601.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 640520013311 its reverse (113310025046), we get a palindrome (753830038357).

The spelling of 640520013311 in words is "six hundred forty billion, five hundred twenty million, thirteen thousand, three hundred eleven".