6136821856 has 72 divisors (see below), whose sum is σ = 13979188440. Its totient is φ = 2642618880.

The previous prime is 6136821839. The next prime is 6136821877. The reversal of 6136821856 is 6581286316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31860 + ... + 115276.

It is an arithmetic number, because the mean of its divisors is an integer number (194155395).

Almost surely, 2^6136821856 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 6136821856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6989594220).

6136821856 is an abundant number, since it is smaller than the sum of its proper divisors (7842366584).

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

6136821856 is a wasteful number, since it uses less digits than its factorization.

6136821856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83468 (or 83449 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 6136821856 is about 78337.8698714740. The cubic root of 6136821856 is about 1830.8292355035.

The spelling of 6136821856 in words is "six billion, one hundred thirty-six million, eight hundred twenty-one thousand, eight hundred fifty-six".