8249664121 has 4 divisors (see below), whose sum is σ = 8249934672. Its totient is φ = 8249393572.

The previous prime is 8249664091. The next prime is 8249664149. The reversal of 8249664121 is 1214669428.

8249664121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8249664121 - 2¹¹ = 8249662073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8249664151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82735 + ... + 152788.

It is an arithmetic number, because the mean of its divisors is an integer number (2062483668).

Almost surely, 2^8249664121 is an apocalyptic number.

It is an amenable number.

8249664121 is a deficient number, since it is larger than the sum of its proper divisors (270551).

8249664121 is a wasteful number, since it uses less digits than its factorization.

8249664121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270550.

The product of its digits is 165888, while the sum is 43.

The square root of 8249664121 is about 90827.6616510631. The cubic root of 8249664121 is about 2020.5925883701.

The spelling of 8249664121 in words is "eight billion, two hundred forty-nine million, six hundred sixty-four thousand, one hundred twenty-one".