2186768257 has 4 divisors (see below), whose sum is σ = 2189093076. Its totient is φ = 2184443440.

The previous prime is 2186768239. The next prime is 2186768317. The reversal of 2186768257 is 7528676812.

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 755205361 + 1431562896 = 27481^2 + 37836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2186768257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2186768237) 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, 1160998 + ... + 1162879.

It is an arithmetic number, because the mean of its divisors is an integer number (547273269).

Almost surely, 2^2186768257 is an apocalyptic number.

It is an amenable number.

2186768257 is a deficient number, since it is larger than the sum of its proper divisors (2324819).

2186768257 is an equidigital number, since it uses as much as digits as its factorization.

2186768257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324818.

The product of its digits is 2257920, while the sum is 52.

The square root of 2186768257 is about 46762.8940186554. The cubic root of 2186768257 is about 1297.9787637501.

The spelling of 2186768257 in words is "two billion, one hundred eighty-six million, seven hundred sixty-eight thousand, two hundred fifty-seven".