2155788717944 has 16 divisors (see below), whose sum is σ = 4042216077120. Its totient is φ = 1077864430720.

The previous prime is 2155788717917. The next prime is 2155788718009. The reversal of 2155788717944 is 4497178875512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3433409 + ... + 4012464.

It is an arithmetic number, because the mean of its divisors is an integer number (252638504820).

Almost surely, 2^{2155788717944} is an apocalyptic number.

It is an amenable number.

2155788717944 is a deficient number, since it is larger than the sum of its proper divisors (1886427359176).

2155788717944 is a wasteful number, since it uses less digits than its factorization.

2155788717944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482070 (or 7482066 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 68.

The spelling of 2155788717944 in words is "two trillion, one hundred fifty-five billion, seven hundred eighty-eight million, seven hundred seventeen thousand, nine hundred forty-four".