2155632611993 has 4 divisors (see below), whose sum is σ = 2463580128000. Its totient is φ = 1847685095988.

The previous prime is 2155632611969. The next prime is 2155632612017. The reversal of 2155632611993 is 3991162365512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2155632611969) and next prime (2155632612017).

It is a cyclic number.

It is not a de Polignac number, because 2155632611993 - 2³⁰ = 2154558870169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155634611993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153973757993 + ... + 153973758006.

It is an arithmetic number, because the mean of its divisors is an integer number (615895032000).

Almost surely, 2^{2155632611993} is an apocalyptic number.

It is an amenable number.

2155632611993 is a deficient number, since it is larger than the sum of its proper divisors (307947516007).

2155632611993 is an equidigital number, since it uses as much as digits as its factorization.

2155632611993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307947516006.

The product of its digits is 2624400, while the sum is 53.

The spelling of 2155632611993 in words is "two trillion, one hundred fifty-five billion, six hundred thirty-two million, six hundred eleven thousand, nine hundred ninety-three".