2155568453 has 4 divisors (see below), whose sum is σ = 2156281260. Its totient is φ = 2154855648.

The previous prime is 2155568383. The next prime is 2155568491. The reversal of 2155568453 is 3548655512.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1923524164 + 232044289 = 43858^2 + 15233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155568453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155538453) 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, 351848 + ... + 357921.

It is an arithmetic number, because the mean of its divisors is an integer number (539070315).

Almost surely, 2^2155568453 is an apocalyptic number.

It is an amenable number.

2155568453 is a deficient number, since it is larger than the sum of its proper divisors (712807).

2155568453 is an equidigital number, since it uses as much as digits as its factorization.

2155568453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712806.

The product of its digits is 720000, while the sum is 44.

The square root of 2155568453 is about 46428.0998211213. The cubic root of 2155568453 is about 1291.7761829658.

The spelling of 2155568453 in words is "two billion, one hundred fifty-five million, five hundred sixty-eight thousand, four hundred fifty-three".