6612654221 has 4 divisors (see below), whose sum is σ = 6680826012. Its totient is φ = 6544482432.

The previous prime is 6612654193. The next prime is 6612654247. The reversal of 6612654221 is 1224562166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224562166 = 2 ⋅612281083.

It can be written as a sum of positive squares in 2 ways, for example, as 2385834025 + 4226820196 = 48845^2 + 65014^2 .

It is a cyclic number.

It is not a de Polignac number, because 6612654221 - 2¹⁰ = 6612653197 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 (6612657221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34085750 + ... + 34085943.

It is an arithmetic number, because the mean of its divisors is an integer number (1670206503).

Almost surely, 2^6612654221 is an apocalyptic number.

It is an amenable number.

6612654221 is a deficient number, since it is larger than the sum of its proper divisors (68171791).

6612654221 is an equidigital number, since it uses as much as digits as its factorization.

6612654221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68171790.

The product of its digits is 34560, while the sum is 35.

The square root of 6612654221 is about 81318.2280980101. The cubic root of 6612654221 is about 1876.9755032738.

The spelling of 6612654221 in words is "six billion, six hundred twelve million, six hundred fifty-four thousand, two hundred twenty-one".