6664035121 has 4 divisors (see below), whose sum is σ = 6732736612. Its totient is φ = 6595333632.

The previous prime is 6664035089. The next prime is 6664035127. The reversal of 6664035121 is 1215304666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1215304666 = 2 ⋅607652333.

It can be written as a sum of positive squares in 2 ways, for example, as 4327666225 + 2336368896 = 65785^2 + 48336^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664035121 - 2⁵ = 6664035089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6664035127) 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, 34350600 + ... + 34350793.

It is an arithmetic number, because the mean of its divisors is an integer number (1683184153).

Almost surely, 2^6664035121 is an apocalyptic number.

It is an amenable number.

6664035121 is a deficient number, since it is larger than the sum of its proper divisors (68701491).

6664035121 is an equidigital number, since it uses as much as digits as its factorization.

6664035121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68701490.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6664035121 is about 81633.5416419011. The cubic root of 6664035121 is about 1881.8243872430.

Adding to 6664035121 its reverse (1215304666), we get a palindrome (7879339787).

It can be divided in two parts, 66640 and 35121, that added together give a square (101761 = 319²).

The spelling of 6664035121 in words is "six billion, six hundred sixty-four million, thirty-five thousand, one hundred twenty-one".