2566191329 has 4 divisors (see below), whose sum is σ = 2763590676. Its totient is φ = 2368791984.

The previous prime is 2566191323. The next prime is 2566191391. The reversal of 2566191329 is 9231916652.

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 673506304 + 1892685025 = 25952^2 + 43505^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2566191329 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 2566191329.

It is not an unprimeable number, because it can be changed into a prime (2566191323) 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, 98699654 + ... + 98699679.

It is an arithmetic number, because the mean of its divisors is an integer number (690897669).

Almost surely, 2^2566191329 is an apocalyptic number.

It is an amenable number.

2566191329 is a deficient number, since it is larger than the sum of its proper divisors (197399347).

2566191329 is a wasteful number, since it uses less digits than its factorization.

2566191329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197399346.

The product of its digits is 174960, while the sum is 44.

The square root of 2566191329 is about 50657.5890563300. The cubic root of 2566191329 is about 1369.0826844512.

The spelling of 2566191329 in words is "two billion, five hundred sixty-six million, one hundred ninety-one thousand, three hundred twenty-nine".