2156523055 has 4 divisors (see below), whose sum is σ = 2587827672. Its totient is φ = 1725218440.

The previous prime is 2156523053. The next prime is 2156523067. The reversal of 2156523055 is 5503256512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2156523055 - 2¹ = 2156523053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156523055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156523053) 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, 215652301 + ... + 215652310.

It is an arithmetic number, because the mean of its divisors is an integer number (646956918).

Almost surely, 2^2156523055 is an apocalyptic number.

2156523055 is a deficient number, since it is larger than the sum of its proper divisors (431304617).

2156523055 is an equidigital number, since it uses as much as digits as its factorization.

2156523055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431304616.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 2156523055 is about 46438.3791168469. The cubic root of 2156523055 is about 1291.9668442178.

Adding to 2156523055 its reverse (5503256512), we get a palindrome (7659779567).

The spelling of 2156523055 in words is "two billion, one hundred fifty-six million, five hundred twenty-three thousand, fifty-five".