268081353257 has 4 divisors (see below), whose sum is σ = 268175850756. Its totient is φ = 267986855760.

The previous prime is 268081353217. The next prime is 268081353329. The reversal of 268081353257 is 752353180862.

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 23574838681 + 244506514576 = 153541^2 + 494476^2 .

It is a cyclic number.

It is not a de Polignac number, because 268081353257 - 2⁶ = 268081353193 is a prime.

It is a super-2 number, since 2×268081353257² (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 (268081353217) 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, 47244494 + ... + 47250167.

It is an arithmetic number, because the mean of its divisors is an integer number (67043962689).

Almost surely, 2^268081353257 is an apocalyptic number.

It is an amenable number.

268081353257 is a deficient number, since it is larger than the sum of its proper divisors (94497499).

268081353257 is an equidigital number, since it uses as much as digits as its factorization.

268081353257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94497498.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 268081353257 in words is "two hundred sixty-eight billion, eighty-one million, three hundred fifty-three thousand, two hundred fifty-seven".