640256113611 has 64 divisors (see below), whose sum is σ = 986046566400. Its totient is φ = 410270515200.

The previous prime is 640256113603. The next prime is 640256113633. The reversal of 640256113611 is 116311652046.

640256113611 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 5 + 611 + 36 + 1 + 1 = 666.

It is not a de Polignac number, because 640256113611 - 2³ = 640256113603 is a prime.

It is a super-3 number, since 3×640256113611³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (640256112611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 192325195 + ... + 192328523.

It is an arithmetic number, because the mean of its divisors is an integer number (15406977600).

Almost surely, 2^640256113611 is an apocalyptic number.

640256113611 is a deficient number, since it is larger than the sum of its proper divisors (345790452789).

640256113611 is a wasteful number, since it uses less digits than its factorization.

640256113611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897 (or 5891 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 640256113611 its reverse (116311652046), we get a palindrome (756567765657).

The spelling of 640256113611 in words is "six hundred forty billion, two hundred fifty-six million, one hundred thirteen thousand, six hundred eleven".