2123236431655 has 16 divisors (see below), whose sum is σ = 2572949623104. Its totient is φ = 1681907996160.

The previous prime is 2123236431647. The next prime is 2123236431661. The reversal of 2123236431655 is 5561346323212.

It is not a de Polignac number, because 2123236431655 - 2³ = 2123236431647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1263459 + ... + 2417188.

It is an arithmetic number, because the mean of its divisors is an integer number (160809351444).

Almost surely, 2^{2123236431655} is an apocalyptic number.

2123236431655 is a deficient number, since it is larger than the sum of its proper divisors (449713191449).

2123236431655 is a wasteful number, since it uses less digits than its factorization.

2123236431655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681786.

The product of its digits is 777600, while the sum is 43.

The spelling of 2123236431655 in words is "two trillion, one hundred twenty-three billion, two hundred thirty-six million, four hundred thirty-one thousand, six hundred fifty-five".