11868651998281 has 9 divisors (see below), whose sum is σ = 12851902435431. Its totient is φ = 10955637426552.

The previous prime is 11868651998257. The next prime is 11868651998429. The reversal of 11868651998281 is 18289915686811.

The square root of 11868651998281 is 3445091.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1755717751225 + 10112934247056 = 1325035^2 + 3180084^2 .

It is not a de Polignac number, because 11868651998281 - 2¹⁷ = 11868651867209 is a prime.

It is a super-2 number, since 2×11868651998281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11868651998081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 44653680 + ... + 44918686.

Almost surely, 2^{11868651998281} is an apocalyptic number.

11868651998281 is the 3445091-st square number.

11868651998281 is the 1722546-th centered octagonal number.

It is an amenable number.

11868651998281 is a deficient number, since it is larger than the sum of its proper divisors (983250437150).

11868651998281 is an frugal number, since it uses more digits than its factorization.

11868651998281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530040 (or 265020 counting only the distinct ones).

The product of its digits is 119439360, while the sum is 73.

The spelling of 11868651998281 in words is "eleven trillion, eight hundred sixty-eight billion, six hundred fifty-one million, nine hundred ninety-eight thousand, two hundred eighty-one".