4991938818049 has 4 divisors (see below), whose sum is σ = 4991999519700. Its totient is φ = 4991878116400.

The previous prime is 4991938818001. The next prime is 4991938818059. The reversal of 4991938818049 is 9408188391994.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2465088403600 + 2526850414449 = 1570060^2 + 1589607^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991938818049 - 2²³ = 4991930429441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991938818059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30227302 + ... + 30391999.

It is an arithmetic number, because the mean of its divisors is an integer number (1247999879925).

Almost surely, 2^{4991938818049} is an apocalyptic number.

It is an amenable number.

4991938818049 is a deficient number, since it is larger than the sum of its proper divisors (60701651).

4991938818049 is an equidigital number, since it uses as much as digits as its factorization.

4991938818049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60701650.

The product of its (nonzero) digits is 161243136, while the sum is 73.

The spelling of 4991938818049 in words is "four trillion, nine hundred ninety-one billion, nine hundred thirty-eight million, eight hundred eighteen thousand, forty-nine".