268268267521 has 4 divisors (see below), whose sum is σ = 268270975044. Its totient is φ = 268265560000.

The previous prime is 268268267489. The next prime is 268268267549. The reversal of 268268267521 is 125762862862.

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 129168360000 + 139099907521 = 359400^2 + 372961^2 .

It is a cyclic number.

It is not a de Polignac number, because 268268267521 - 2⁵ = 268268267489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268268267221) 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, 1199260 + ... + 1405261.

It is an arithmetic number, because the mean of its divisors is an integer number (67067743761).

Almost surely, 2^268268267521 is an apocalyptic number.

It is an amenable number.

268268267521 is a deficient number, since it is larger than the sum of its proper divisors (2707523).

268268267521 is a wasteful number, since it uses less digits than its factorization.

268268267521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707522.

The product of its digits is 7741440, while the sum is 55.

The spelling of 268268267521 in words is "two hundred sixty-eight billion, two hundred sixty-eight million, two hundred sixty-seven thousand, five hundred twenty-one".