268536636881 has 16 divisors (see below), whose sum is σ = 275818804800. Its totient is φ = 261303211008.

The previous prime is 268536636871. The next prime is 268536636931. The reversal of 268536636881 is 188636635862.

It is a cyclic number.

It is not a de Polignac number, because 268536636881 - 2¹⁸ = 268536374737 is a prime.

It is a super-2 number, since 2×268536636881² (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 (268536636871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15131045 + ... + 15148781.

It is an arithmetic number, because the mean of its divisors is an integer number (17238675300).

Almost surely, 2^268536636881 is an apocalyptic number.

It is an amenable number.

268536636881 is a deficient number, since it is larger than the sum of its proper divisors (7282167919).

268536636881 is a wasteful number, since it uses less digits than its factorization.

268536636881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19088.

The product of its digits is 59719680, while the sum is 62.

The spelling of 268536636881 in words is "two hundred sixty-eight billion, five hundred thirty-six million, six hundred thirty-six thousand, eight hundred eighty-one".