6497115571221 has 32 divisors (see below), whose sum is σ = 9483040089600. Its totient is φ = 3924030070080.

The previous prime is 6497115571213. The next prime is 6497115571229. The reversal of 6497115571221 is 1221755117946.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6497115571213) and next prime (6497115571229).

It is not a de Polignac number, because 6497115571221 - 2³ = 6497115571213 is a prime.

It is a super-2 number, since 2×6497115571221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6497115571229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52406535 + ... + 52530363.

It is an arithmetic number, because the mean of its divisors is an integer number (296345002800).

Almost surely, 2^{6497115571221} is an apocalyptic number.

It is an amenable number.

6497115571221 is a deficient number, since it is larger than the sum of its proper divisors (2985924518379).

6497115571221 is a wasteful number, since it uses less digits than its factorization.

6497115571221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129329.

The product of its digits is 1058400, while the sum is 51.

The spelling of 6497115571221 in words is "six trillion, four hundred ninety-seven billion, one hundred fifteen million, five hundred seventy-one thousand, two hundred twenty-one".