2155678844 has 24 divisors (see below), whose sum is σ = 4130708400. Its totient is φ = 976206080.

The previous prime is 2155678813. The next prime is 2155678849. The reversal of 2155678844 is 4488765512.

It is a junction number, because it is equal to n+sod(n) for n = 2155678792 and 2155678801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155678849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79229 + ... + 102900.

It is an arithmetic number, because the mean of its divisors is an integer number (172112850).

Almost surely, 2^2155678844 is an apocalyptic number.

It is an amenable number.

2155678844 is a deficient number, since it is larger than the sum of its proper divisors (1975029556).

2155678844 is a wasteful number, since it uses less digits than its factorization.

2155678844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182413 (or 182411 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 50.

The square root of 2155678844 is about 46429.2886441307. The cubic root of 2155678844 is about 1291.7982340757.

The spelling of 2155678844 in words is "two billion, one hundred fifty-five million, six hundred seventy-eight thousand, eight hundred forty-four".