268687949786861 has 64 divisors (see below), whose sum is σ = 307168161914880. Its totient is φ = 232818841728000.

The previous prime is 268687949786819. The next prime is 268687949786891. The reversal of 268687949786861 is 168687949786862.

It is not a de Polignac number, because 268687949786861 - 2³⁴ = 268670769917677 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 (268687949786891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10759987106 + ... + 10760012076.

It is an arithmetic number, because the mean of its divisors is an integer number (4799502529920).

Almost surely, 2^{268687949786861} is an apocalyptic number.

It is an amenable number.

268687949786861 is a deficient number, since it is larger than the sum of its proper divisors (38480212128019).

268687949786861 is a wasteful number, since it uses less digits than its factorization.

268687949786861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26946.

The product of its digits is 168552824832, while the sum is 95.

Subtracting from 268687949786861 its reverse (168687949786862), we obtain a palindrome (99999999999999).

The spelling of 268687949786861 in words is "two hundred sixty-eight trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, eight hundred sixty-one".