6442049991 has 32 divisors (see below), whose sum is σ = 9325792000. Its totient is φ = 3955427424.

The previous prime is 6442049969. The next prime is 6442050019. The reversal of 6442049991 is 1999402446.

It is not a de Polignac number, because 6442049991 - 2⁶ = 6442049927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6442049991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442049291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4079040 + ... + 4080618.

It is an arithmetic number, because the mean of its divisors is an integer number (291431000).

Almost surely, 2^6442049991 is an apocalyptic number.

6442049991 is a deficient number, since it is larger than the sum of its proper divisors (2883742009).

6442049991 is a wasteful number, since it uses less digits than its factorization.

6442049991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 6442049991 is about 80262.3821662427. The cubic root of 6442049991 is about 1860.6928847044.

It can be divided in two parts, 64420 and 49991, that added together give a palindrome (114411).

The spelling of 6442049991 in words is "six billion, four hundred forty-two million, forty-nine thousand, nine hundred ninety-one".