3918566656 has 72 divisors (see below), whose sum is σ = 8211974400. Its totient is φ = 1863720960.

The previous prime is 3918566647. The next prime is 3918566683. The reversal of 3918566656 is 6566658193.

It is a junction number, because it is equal to n+sod(n) for n = 3918566597 and 3918566606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464040 + ... + 472408.

It is an arithmetic number, because the mean of its divisors is an integer number (114055200).

Almost surely, 2^3918566656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3918566656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4105987200).

3918566656 is an abundant number, since it is smaller than the sum of its proper divisors (4293407744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3918566656 is an equidigital number, since it uses as much as digits as its factorization.

3918566656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8475 (or 8461 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 55.

The square root of 3918566656 is about 62598.4556998014. The cubic root of 3918566656 is about 1576.5548305451.

The spelling of 3918566656 in words is "three billion, nine hundred eighteen million, five hundred sixty-six thousand, six hundred fifty-six".