4256640665055 has 64 divisors (see below), whose sum is σ = 7584126827520. Its totient is φ = 2265181365888.

The previous prime is 4256640665041. The next prime is 4256640665071. The reversal of 4256640665055 is 5505660466524.

It is a happy number.

4256640665055 is a `hidden beast` number, since 42 + 56 + 6 + 40 + 6 + 6 + 505 + 5 = 666.

It is not a de Polignac number, because 4256640665055 - 2⁸ = 4256640664799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4256640664992 and 4256640665010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 305500869 + ... + 305514801.

It is an arithmetic number, because the mean of its divisors is an integer number (118501981680).

Almost surely, 2^{4256640665055} is an apocalyptic number.

4256640665055 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

4256640665055 is a deficient number, since it is larger than the sum of its proper divisors (3327486162465).

4256640665055 is a wasteful number, since it uses less digits than its factorization.

4256640665055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18797 (or 18791 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 54.

The spelling of 4256640665055 in words is "four trillion, two hundred fifty-six billion, six hundred forty million, six hundred sixty-five thousand, fifty-five".