268736879618 has 4 divisors (see below), whose sum is σ = 403105319430. Its totient is φ = 134368439808.

The previous prime is 268736879581. The next prime is 268736879623. The reversal of 268736879618 is 816978637862.

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

It can be written as a sum of positive squares in only one way, i.e., 166450128289 + 102286751329 = 407983^2 + 319823^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67184219903 + ... + 67184219906.

Almost surely, 2^268736879618 is an apocalyptic number.

268736879618 is a deficient number, since it is larger than the sum of its proper divisors (134368439812).

268736879618 is a wasteful number, since it uses less digits than its factorization.

268736879618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134368439811.

The product of its digits is 292626432, while the sum is 71.

The spelling of 268736879618 in words is "two hundred sixty-eight billion, seven hundred thirty-six million, eight hundred seventy-nine thousand, six hundred eighteen".