11857564813 has 2 divisors, whose sum is σ = 11857564814. Its totient is φ = 11857564812.

The previous prime is 11857564757. The next prime is 11857564819. The reversal of 11857564813 is 31846575811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11087668804 + 769896009 = 105298^2 + 27747^2 .

It is a cyclic number.

It is not a de Polignac number, because 11857564813 - 2¹³ = 11857556621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11857564819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5928782406 + 5928782407.

It is an arithmetic number, because the mean of its divisors is an integer number (5928782407).

Almost surely, 2^11857564813 is an apocalyptic number.

It is an amenable number.

11857564813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11857564813 is an equidigital number, since it uses as much as digits as its factorization.

11857564813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 49.

The spelling of 11857564813 in words is "eleven billion, eight hundred fifty-seven million, five hundred sixty-four thousand, eight hundred thirteen".