2128332253865 has 4 divisors (see below), whose sum is σ = 2553998704644. Its totient is φ = 1702665803088.

The previous prime is 2128332253847. The next prime is 2128332253871. The reversal of 2128332253865 is 5683522338212.

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 391271517289 + 1737060736576 = 625517^2 + 1317976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128332253865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212833225382 + ... + 212833225391.

It is an arithmetic number, because the mean of its divisors is an integer number (638499676161).

Almost surely, 2^{2128332253865} is an apocalyptic number.

It is an amenable number.

2128332253865 is a deficient number, since it is larger than the sum of its proper divisors (425666450779).

2128332253865 is an equidigital number, since it uses as much as digits as its factorization.

2128332253865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425666450778.

The product of its digits is 4147200, while the sum is 50.

The spelling of 2128332253865 in words is "two trillion, one hundred twenty-eight billion, three hundred thirty-two million, two hundred fifty-three thousand, eight hundred sixty-five".