6645154661211 has 128 divisors (see below), whose sum is σ = 10688489717760. Its totient is φ = 3627373363200.

The previous prime is 6645154661179. The next prime is 6645154661269. The reversal of 6645154661211 is 1121664515466.

It is not a de Polignac number, because 6645154661211 - 2⁵ = 6645154661179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6645154661111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 364648446 + ... + 364666668.

It is an arithmetic number, because the mean of its divisors is an integer number (83503825920).

Almost surely, 2^{6645154661211} is an apocalyptic number.

6645154661211 is a deficient number, since it is larger than the sum of its proper divisors (4043335056549).

6645154661211 is a wasteful number, since it uses less digits than its factorization.

6645154661211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18617.

The product of its digits is 1036800, while the sum is 48.

The spelling of 6645154661211 in words is "six trillion, six hundred forty-five billion, one hundred fifty-four million, six hundred sixty-one thousand, two hundred eleven".