6610506121 has 4 divisors (see below), whose sum is σ = 6627500100. Its totient is φ = 6593512144.

The previous prime is 6610506109. The next prime is 6610506127. The reversal of 6610506121 is 1216050166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216050166 = 2 ⋅608025083.

It can be written as a sum of positive squares in 2 ways, for example, as 3784095225 + 2826410896 = 61515^2 + 53164^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610506121 - 2⁹ = 6610505609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6610506121.

It is not an unprimeable number, because it can be changed into a prime (6610506127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8496406 + ... + 8497183.

It is an arithmetic number, because the mean of its divisors is an integer number (1656875025).

Almost surely, 2^6610506121 is an apocalyptic number.

It is an amenable number.

6610506121 is a deficient number, since it is larger than the sum of its proper divisors (16993979).

6610506121 is a wasteful number, since it uses less digits than its factorization.

6610506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16993978.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 6610506121 is about 81305.0190394172. The cubic root of 6610506121 is about 1876.7722380589.

Adding to 6610506121 its reverse (1216050166), we get a palindrome (7826556287).

The spelling of 6610506121 in words is "six billion, six hundred ten million, five hundred six thousand, one hundred twenty-one".