6640004121 has 8 divisors (see below), whose sum is σ = 8934562560. Its totient is φ = 4386057552.

The previous prime is 6640004099. The next prime is 6640004131. The reversal of 6640004121 is 1214000466.

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

It is not a de Polignac number, because 6640004121 - 2²¹ = 6637906969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640004091 and 6640004100.

It is not an unprimeable number, because it can be changed into a prime (6640004131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10152585 + ... + 10153238.

It is an arithmetic number, because the mean of its divisors is an integer number (1116820320).

Almost surely, 2^6640004121 is an apocalyptic number.

It is an amenable number.

6640004121 is a deficient number, since it is larger than the sum of its proper divisors (2294558439).

6640004121 is a wasteful number, since it uses less digits than its factorization.

6640004121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20305935.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6640004121 is about 81486.2204363413. The cubic root of 6640004121 is about 1879.5596638291.

Adding to 6640004121 its reverse (1214000466), we get a palindrome (7854004587).

The spelling of 6640004121 in words is "six billion, six hundred forty million, four thousand, one hundred twenty-one".