6440158842 has 128 divisors (see below), whose sum is σ = 14480793600. Its totient is φ = 1897219584.

The previous prime is 6440158811. The next prime is 6440158853. The reversal of 6440158842 is 2488510446.

It is a junction number, because it is equal to n+sod(n) for n = 6440158794 and 6440158803.

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, 46332009 + ... + 46332147.

It is an arithmetic number, because the mean of its divisors is an integer number (113131200).

Almost surely, 2^6440158842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440158842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7240396800).

6440158842 is an abundant number, since it is smaller than the sum of its proper divisors (8040634758).

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

6440158842 is a wasteful number, since it uses less digits than its factorization.

6440158842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its (nonzero) digits is 245760, while the sum is 42.

The square root of 6440158842 is about 80250.6002594373. The cubic root of 6440158842 is about 1860.5107898803.

The spelling of 6440158842 in words is "six billion, four hundred forty million, one hundred fifty-eight thousand, eight hundred forty-two".