11878810635817 has 2 divisors, whose sum is σ = 11878810635818. Its totient is φ = 11878810635816.

The previous prime is 11878810635803. The next prime is 11878810635871. The reversal of 11878810635817 is 71853601887811.

Together with next prime (11878810635871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6042063879721 + 5836746756096 = 2458061^2 + 2415936^2 .

It is a cyclic number.

It is not a de Polignac number, because 11878810635817 - 2³⁵ = 11844450897449 is a prime.

It is a super-2 number, since 2×11878810635817² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11878810635317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5939405317908 + 5939405317909.

It is an arithmetic number, because the mean of its divisors is an integer number (5939405317909).

Almost surely, 2^{11878810635817} is an apocalyptic number.

It is an amenable number.

11878810635817 is a deficient number, since it is larger than the sum of its proper divisors (1).

11878810635817 is an equidigital number, since it uses as much as digits as its factorization.

11878810635817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 64.

The spelling of 11878810635817 in words is "eleven trillion, eight hundred seventy-eight billion, eight hundred ten million, six hundred thirty-five thousand, eight hundred seventeen".