268319782281 has 4 divisors (see below), whose sum is σ = 357759709712. Its totient is φ = 178879854852.

The previous prime is 268319782279. The next prime is 268319782321. The reversal of 268319782281 is 182287913862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 268319782281 - 2¹ = 268319782279 is a prime.

It is a super-2 number, since 2×268319782281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268319782271) 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, 44719963711 + ... + 44719963716.

It is an arithmetic number, because the mean of its divisors is an integer number (89439927428).

Almost surely, 2^268319782281 is an apocalyptic number.

It is an amenable number.

268319782281 is a deficient number, since it is larger than the sum of its proper divisors (89439927431).

268319782281 is an equidigital number, since it uses as much as digits as its factorization.

268319782281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89439927430.

The product of its digits is 4644864, while the sum is 57.

The spelling of 268319782281 in words is "two hundred sixty-eight billion, three hundred nineteen million, seven hundred eighty-two thousand, two hundred eighty-one".