2143645745 has 4 divisors (see below), whose sum is σ = 2572374900. Its totient is φ = 1714916592.

The previous prime is 2143645741. The next prime is 2143645769. The reversal of 2143645745 is 5475463412.

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 341473441 + 1802172304 = 18479^2 + 42452^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143645745 - 2² = 2143645741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2143645741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214364570 + ... + 214364579.

It is an arithmetic number, because the mean of its divisors is an integer number (643093725).

Almost surely, 2^2143645745 is an apocalyptic number.

It is an amenable number.

2143645745 is a deficient number, since it is larger than the sum of its proper divisors (428729155).

2143645745 is an equidigital number, since it uses as much as digits as its factorization.

2143645745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428729154.

The product of its digits is 403200, while the sum is 41.

The square root of 2143645745 is about 46299.5220817667. The cubic root of 2143645745 is about 1289.3901219429.

The spelling of 2143645745 in words is "two billion, one hundred forty-three million, six hundred forty-five thousand, seven hundred forty-five".