6610151221 has 8 divisors (see below), whose sum is σ = 6997114080. Its totient is φ = 6233790192.

The previous prime is 6610151213. The next prime is 6610151267. The reversal of 6610151221 is 1221510166.

It is a happy number.

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 6610151221 - 2³ = 6610151213 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 (6610151921) 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, 2649175 + ... + 2651668.

It is an arithmetic number, because the mean of its divisors is an integer number (874639260).

Almost surely, 2^6610151221 is an apocalyptic number.

It is an amenable number.

6610151221 is a deficient number, since it is larger than the sum of its proper divisors (386962859).

6610151221 is a wasteful number, since it uses less digits than its factorization.

6610151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300915.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 6610151221 is about 81302.8364880340. The cubic root of 6610151221 is about 1876.7386512011.

Adding to 6610151221 its reverse (1221510166), we get a palindrome (7831661387).

The spelling of 6610151221 in words is "six billion, six hundred ten million, one hundred fifty-one thousand, two hundred twenty-one".