268178871863 has 4 divisors (see below), whose sum is σ = 306490139280. Its totient is φ = 229867604448.

The previous prime is 268178871811. The next prime is 268178871871. The reversal of 268178871863 is 368178871862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 268178871863 - 2⁶ = 268178871799 is a prime.

It is a super-2 number, since 2×268178871863² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 268178871863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268178876863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19155633698 + ... + 19155633711.

It is an arithmetic number, because the mean of its divisors is an integer number (76622534820).

Almost surely, 2^268178871863 is an apocalyptic number.

268178871863 is a deficient number, since it is larger than the sum of its proper divisors (38311267417).

268178871863 is an equidigital number, since it uses as much as digits as its factorization.

268178871863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38311267416.

The product of its digits is 43352064, while the sum is 65.

Subtracting 268178871863 from its reverse (368178871862), we obtain a palindrome (99999999999).

The spelling of 268178871863 in words is "two hundred sixty-eight billion, one hundred seventy-eight million, eight hundred seventy-one thousand, eight hundred sixty-three".