6650121217 has 4 divisors (see below), whose sum is σ = 7041304836. Its totient is φ = 6258937600.

The previous prime is 6650121187. The next prime is 6650121253. The reversal of 6650121217 is 7121210566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6078385296 + 571735921 = 77964^2 + 23911^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6650121217 is a prime.

It is a super-2 number, since 2×6650121217² = 88448224401587122178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6650121017) 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, 195591784 + ... + 195591817.

It is an arithmetic number, because the mean of its divisors is an integer number (1760326209).

Almost surely, 2^6650121217 is an apocalyptic number.

It is an amenable number.

6650121217 is a deficient number, since it is larger than the sum of its proper divisors (391183619).

6650121217 is a wasteful number, since it uses less digits than its factorization.

6650121217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391183618.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 6650121217 is about 81548.2753772267. The cubic root of 6650121217 is about 1880.5137815061.

The spelling of 6650121217 in words is "six billion, six hundred fifty million, one hundred twenty-one thousand, two hundred seventeen".