640520013326 has 8 divisors (see below), whose sum is σ = 969282498384. Its totient is φ = 317425847200.

The previous prime is 640520013299. The next prime is 640520013337. The reversal of 640520013326 is 623310025046.

640520013326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×640520013326² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640520013292 and 640520013301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417079450 + ... + 1417079901.

It is an arithmetic number, because the mean of its divisors is an integer number (121160312298).

Almost surely, 2^640520013326 is an apocalyptic number.

640520013326 is a deficient number, since it is larger than the sum of its proper divisors (328762485058).

640520013326 is a wasteful number, since it uses less digits than its factorization.

640520013326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834159466.

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 640520013326 in words is "six hundred forty billion, five hundred twenty million, thirteen thousand, three hundred twenty-six".