11511578857 has 2 divisors, whose sum is σ = 11511578858. Its totient is φ = 11511578856.

The previous prime is 11511578839. The next prime is 11511578873. The reversal of 11511578857 is 75887511511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7543964736 + 3967614121 = 86856^2 + 62989^2 .

It is a cyclic number.

It is not a de Polignac number, because 11511578857 - 2²³ = 11503190249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11511578857.

It is not a weakly prime, because it can be changed into another prime (11511578257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755789428 + 5755789429.

It is an arithmetic number, because the mean of its divisors is an integer number (5755789429).

Almost surely, 2^11511578857 is an apocalyptic number.

It is an amenable number.

11511578857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511578857 is an equidigital number, since it uses as much as digits as its factorization.

11511578857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 392000, while the sum is 49.

The spelling of 11511578857 in words is "eleven billion, five hundred eleven million, five hundred seventy-eight thousand, eight hundred fifty-seven".