6658121197 has 16 divisors (see below), whose sum is σ = 8203370112. Its totient is φ = 5262333120.

The previous prime is 6658121153. The next prime is 6658121203. The reversal of 6658121197 is 7911218566.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6658121197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6658125197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47547 + ... + 124807.

It is an arithmetic number, because the mean of its divisors is an integer number (512710632).

Almost surely, 2^6658121197 is an apocalyptic number.

It is an amenable number.

6658121197 is a deficient number, since it is larger than the sum of its proper divisors (1545248915).

6658121197 is a wasteful number, since it uses less digits than its factorization.

6658121197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78228.

The product of its digits is 181440, while the sum is 46.

The square root of 6658121197 is about 81597.3112118285. The cubic root of 6658121197 is about 1881.2675544371.

It can be divided in two parts, 66581 and 21197, that added together give a palindrome (87778).

The spelling of 6658121197 in words is "six billion, six hundred fifty-eight million, one hundred twenty-one thousand, one hundred ninety-seven".