6639838324056 has 256 divisors, whose sum is σ = 21278883840000. Its totient is φ = 1879141783680.

The previous prime is 6639838324039. The next prime is 6639838324073. The reversal of 6639838324056 is 6504238389366.

6639838324056 is a `hidden beast` number, since 6 + 6 + 3 + 9 + 8 + 383 + 240 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (6639838324039) and next prime (6639838324073).

It is a super-2 number, since 2×6639838324056² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 6639838323984 and 6639838324002.

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, 121139745 + ... + 121194543.

It is an arithmetic number, because the mean of its divisors is an integer number (83120640000).

Almost surely, 2^{6639838324056} 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 6639838324056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10639441920000).

6639838324056 is an abundant number, since it is smaller than the sum of its proper divisors (14639045515944).

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

6639838324056 is a wasteful number, since it uses less digits than its factorization.

6639838324056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55579 (or 55569 counting only the distinct ones).

The product of its (nonzero) digits is 134369280, while the sum is 63.

The spelling of 6639838324056 in words is "six trillion, six hundred thirty-nine billion, eight hundred thirty-eight million, three hundred twenty-four thousand, fifty-six".