2143993609897 has 4 divisors (see below), whose sum is σ = 2144784462336. Its totient is φ = 2143202757460.

The previous prime is 2143993609871. The next prime is 2143993609909. The reversal of 2143993609897 is 7989063993412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2143993609897 - 2²³ = 2143985221289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143993609817) 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, 395422153 + ... + 395427574.

It is an arithmetic number, because the mean of its divisors is an integer number (536196115584).

Almost surely, 2^{2143993609897} is an apocalyptic number.

It is an amenable number.

2143993609897 is a deficient number, since it is larger than the sum of its proper divisors (790852439).

2143993609897 is an equidigital number, since it uses as much as digits as its factorization.

2143993609897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790852438.

The product of its (nonzero) digits is 158723712, while the sum is 70.

The spelling of 2143993609897 in words is "two trillion, one hundred forty-three billion, nine hundred ninety-three million, six hundred nine thousand, eight hundred ninety-seven".