11857163081 has 2 divisors, whose sum is σ = 11857163082. Its totient is φ = 11857163080.

The previous prime is 11857163057. The next prime is 11857163089. The reversal of 11857163081 is 18036175811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8066913856 + 3790249225 = 89816^2 + 61565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11857163081 is a prime.

It is a super-2 number, since 2×11857163081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11857163089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5928581540 + 5928581541.

It is an arithmetic number, because the mean of its divisors is an integer number (5928581541).

Almost surely, 2^11857163081 is an apocalyptic number.

It is an amenable number.

11857163081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11857163081 is an equidigital number, since it uses as much as digits as its factorization.

11857163081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 11857163081 in words is "eleven billion, eight hundred fifty-seven million, one hundred sixty-three thousand, eighty-one".