2155544445 has 16 divisors (see below), whose sum is σ = 3490425792. Its totient is φ = 1135772160.

The previous prime is 2155544431. The next prime is 2155544449. The reversal of 2155544445 is 5444455512.

It is not a de Polignac number, because 2155544445 - 2¹¹ = 2155542397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155544449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864436 + ... + 866925.

It is an arithmetic number, because the mean of its divisors is an integer number (218151612).

Almost surely, 2^2155544445 is an apocalyptic number.

It is an amenable number.

2155544445 is a deficient number, since it is larger than the sum of its proper divisors (1334881347).

2155544445 is a wasteful number, since it uses less digits than its factorization.

2155544445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731452.

The product of its digits is 320000, while the sum is 39.

The square root of 2155544445 is about 46427.8412700828. The cubic root of 2155544445 is about 1291.7713871577.

Adding to 2155544445 its reverse (5444455512), we get a palindrome (7599999957).

The spelling of 2155544445 in words is "two billion, one hundred fifty-five million, five hundred forty-four thousand, four hundred forty-five".