268626231521 has 4 divisors (see below), whose sum is σ = 271395574212. Its totient is φ = 265856888832.

The previous prime is 268626231491. The next prime is 268626231571. The reversal of 268626231521 is 125132626862.

268626231521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61323588496 + 207302643025 = 247636^2 + 455305^2 .

It is a cyclic number.

It is not a de Polignac number, because 268626231521 - 2¹⁰ = 268626230497 is a prime.

It is a super-2 number, since 2×268626231521² (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 (268626231571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1384671200 + ... + 1384671393.

It is an arithmetic number, because the mean of its divisors is an integer number (67848893553).

Almost surely, 2^268626231521 is an apocalyptic number.

It is an amenable number.

268626231521 is a deficient number, since it is larger than the sum of its proper divisors (2769342691).

268626231521 is an equidigital number, since it uses as much as digits as its factorization.

268626231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2769342690.

The product of its digits is 414720, while the sum is 44.

The spelling of 268626231521 in words is "two hundred sixty-eight billion, six hundred twenty-six million, two hundred thirty-one thousand, five hundred twenty-one".