8144536721 has 8 divisors (see below), whose sum is σ = 8418756864. Its totient is φ = 7871034960.

The previous prime is 8144536709. The next prime is 8144536759. The reversal of 8144536721 is 1276354418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8144536721 - 2¹⁰ = 8144535697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8144536021) 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 7 ways as a sum of consecutive naturals, for example, 156491 + ... + 201936.

It is an arithmetic number, because the mean of its divisors is an integer number (1052344608).

Almost surely, 2^8144536721 is an apocalyptic number.

It is an amenable number.

8144536721 is a deficient number, since it is larger than the sum of its proper divisors (274220143).

8144536721 is a wasteful number, since it uses less digits than its factorization.

8144536721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359191.

The product of its digits is 161280, while the sum is 41.

The square root of 8144536721 is about 90247.0870499431. The cubic root of 8144536721 is about 2011.9729084547.

The spelling of 8144536721 in words is "eight billion, one hundred forty-four million, five hundred thirty-six thousand, seven hundred twenty-one".