2128779634653 has 12 divisors (see below), whose sum is σ = 3514175904928. Its totient is φ = 1216445505480.

The previous prime is 2128779634571. The next prime is 2128779634669. The reversal of 2128779634653 is 3564369778212.

It is a happy number.

2128779634653 is a `hidden beast` number, since 2 + 1 + 2 + 87 + 7 + 96 + 3 + 465 + 3 = 666.

It is not a de Polignac number, because 2128779634653 - 2²² = 2128775440349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 33790152931 = 2128779634653 / (2 + 1 + 2 + 8 + 7 + 7 + 9 + 6 + 3 + 4 + 6 + 5 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128779634153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16895076403 + ... + 16895076528.

Almost surely, 2^{2128779634653} is an apocalyptic number.

It is an amenable number.

2128779634653 is a deficient number, since it is larger than the sum of its proper divisors (1385396270275).

2128779634653 is a wasteful number, since it uses less digits than its factorization.

2128779634653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33790152944 (or 33790152941 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 63.

The spelling of 2128779634653 in words is "two trillion, one hundred twenty-eight billion, seven hundred seventy-nine million, six hundred thirty-four thousand, six hundred fifty-three".