268747781809 has 12 divisors (see below), whose sum is σ = 291522458700. Its totient is φ = 247638802944.

The previous prime is 268747781803. The next prime is 268747781821. The reversal of 268747781809 is 908187747862.

It can be written as a sum of positive squares in 6 ways, for example, as 123937090209 + 144810691600 = 352047^2 + 380540^2 .

It is not a de Polignac number, because 268747781809 - 2⁵ = 268747781777 is a prime.

It is a super-3 number, since 3×268747781809³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268747781803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1301224 + ... + 1493545.

It is an arithmetic number, because the mean of its divisors is an integer number (24293538225).

Almost surely, 2^268747781809 is an apocalyptic number.

It is an amenable number.

268747781809 is a deficient number, since it is larger than the sum of its proper divisors (22774676891).

268747781809 is a wasteful number, since it uses less digits than its factorization.

268747781809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795364 (or 2795351 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 67.

The spelling of 268747781809 in words is "two hundred sixty-eight billion, seven hundred forty-seven million, seven hundred eighty-one thousand, eight hundred nine".