2640648971181 has 96 divisors (see below), whose sum is σ = 4129457203200. Its totient is φ = 1487873836800.

The previous prime is 2640648971119. The next prime is 2640648971189. The reversal of 2640648971181 is 1811798460462.

It is not a de Polignac number, because 2640648971181 - 2⁹ = 2640648970669 is a prime.

It is a super-2 number, since 2×2640648971181² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640648971189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 153170160 + ... + 153187398.

It is an arithmetic number, because the mean of its divisors is an integer number (43015179200).

Almost surely, 2^{2640648971181} is an apocalyptic number.

It is an amenable number.

2640648971181 is a deficient number, since it is larger than the sum of its proper divisors (1488808232019).

2640648971181 is a wasteful number, since it uses less digits than its factorization.

2640648971181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17499 (or 17462 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 2640648971181 in words is "two trillion, six hundred forty billion, six hundred forty-eight million, nine hundred seventy-one thousand, one hundred eighty-one".