4993721815 has 4 divisors (see below), whose sum is σ = 5992466184. Its totient is φ = 3994977448.

The previous prime is 4993721807. The next prime is 4993721819. The reversal of 4993721815 is 5181273994.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4993721815 - 2³ = 4993721807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4993721819) 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, 499372177 + ... + 499372186.

It is an arithmetic number, because the mean of its divisors is an integer number (1498116546).

Almost surely, 2^4993721815 is an apocalyptic number.

4993721815 is a deficient number, since it is larger than the sum of its proper divisors (998744369).

4993721815 is an equidigital number, since it uses as much as digits as its factorization.

4993721815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998744368.

The product of its digits is 544320, while the sum is 49.

The square root of 4993721815 is about 70666.2707025070. The cubic root of 4993721815 is about 1709.2599438906.

The spelling of 4993721815 in words is "four billion, nine hundred ninety-three million, seven hundred twenty-one thousand, eight hundred fifteen".