11878345821157 has 4 divisors (see below), whose sum is σ = 11938641993036. Its totient is φ = 11818049649280.

The previous prime is 11878345821151. The next prime is 11878345821161. The reversal of 11878345821157 is 75112854387811.

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 5793485325156 + 6084860496001 = 2406966^2 + 2466751^2 .

It is a cyclic number.

It is not a de Polignac number, because 11878345821157 - 2¹⁵ = 11878345788389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11878345821095 and 11878345821104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11878345821151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30148085644 + ... + 30148086037.

It is an arithmetic number, because the mean of its divisors is an integer number (2984660498259).

Almost surely, 2^{11878345821157} is an apocalyptic number.

It is an amenable number.

11878345821157 is a deficient number, since it is larger than the sum of its proper divisors (60296171879).

11878345821157 is an equidigital number, since it uses as much as digits as its factorization.

11878345821157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60296171878.

The product of its digits is 15052800, while the sum is 61.

The spelling of 11878345821157 in words is "eleven trillion, eight hundred seventy-eight billion, three hundred forty-five million, eight hundred twenty-one thousand, one hundred fifty-seven".