6541215412621 has 16 divisors (see below), whose sum is σ = 7005600990720. Its totient is φ = 6085710512640.

The previous prime is 6541215412549. The next prime is 6541215412673. The reversal of 6541215412621 is 1262145121456.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6541215412621 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 (6541215419621) 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, 5397700 + ... + 6497506.

It is an arithmetic number, because the mean of its divisors is an integer number (437850061920).

Almost surely, 2^{6541215412621} is an apocalyptic number.

It is an amenable number.

6541215412621 is a deficient number, since it is larger than the sum of its proper divisors (464385578099).

6541215412621 is a wasteful number, since it uses less digits than its factorization.

6541215412621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103844.

The product of its digits is 115200, while the sum is 40.

The spelling of 6541215412621 in words is "six trillion, five hundred forty-one billion, two hundred fifteen million, four hundred twelve thousand, six hundred twenty-one".