6418637856 has 96 divisors (see below), whose sum is σ = 18751017600. Its totient is φ = 2136119040.

The previous prime is 6418637851. The next prime is 6418637857. The reversal of 6418637856 is 6587368146.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (6418637851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565485 + ... + 576723.

It is an arithmetic number, because the mean of its divisors is an integer number (195323100).

Almost surely, 2^6418637856 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 6418637856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9375508800).

6418637856 is an abundant number, since it is smaller than the sum of its proper divisors (12332379744).

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

6418637856 is a wasteful number, since it uses less digits than its factorization.

6418637856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919 (or 11905 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 6418637856 is about 80116.4019162119. The cubic root of 6418637856 is about 1858.4360631008.

The spelling of 6418637856 in words is "six billion, four hundred eighteen million, six hundred thirty-seven thousand, eight hundred fifty-six".