11805623257 has 4 divisors (see below), whose sum is σ = 11835064116. Its totient is φ = 11776182400.

The previous prime is 11805623239. The next prime is 11805623261. The reversal of 11805623257 is 75232650811.

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 9284478736 + 2521144521 = 96356^2 + 50211^2 .

It is a cyclic number.

It is not a de Polignac number, because 11805623257 - 2¹¹ = 11805621209 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11805653257) 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, 14719828 + ... + 14720629.

It is an arithmetic number, because the mean of its divisors is an integer number (2958766029).

Almost surely, 2^11805623257 is an apocalyptic number.

It is an amenable number.

11805623257 is a deficient number, since it is larger than the sum of its proper divisors (29440859).

11805623257 is an equidigital number, since it uses as much as digits as its factorization.

11805623257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29440858.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 11805623257 in words is "eleven billion, eight hundred five million, six hundred twenty-three thousand, two hundred fifty-seven".