268788887861 has 4 divisors (see below), whose sum is σ = 289464956172. Its totient is φ = 248112819552.

The previous prime is 268788887839. The next prime is 268788887981. The reversal of 268788887861 is 168788887862.

268788887861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 85342858225 + 183446029636 = 292135^2 + 428306^2 .

It is not a de Polignac number, because 268788887861 - 2³⁴ = 251609018677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268788887821) 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 in 3 ways as a sum of consecutive naturals, for example, 10338034136 + ... + 10338034161.

It is an arithmetic number, because the mean of its divisors is an integer number (72366239043).

Almost surely, 2^268788887861 is an apocalyptic number.

It is an amenable number.

268788887861 is a deficient number, since it is larger than the sum of its proper divisors (20676068311).

268788887861 is a wasteful number, since it uses less digits than its factorization.

268788887861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20676068310.

The product of its digits is 924844032, while the sum is 77.

Subtracting from 268788887861 its reverse (168788887862), we obtain a palindrome (99999999999).

The spelling of 268788887861 in words is "two hundred sixty-eight billion, seven hundred eighty-eight million, eight hundred eighty-seven thousand, eight hundred sixty-one".