11316771849681 has 9 divisors (see below), whose sum is σ = 16346462804841. Its totient is φ = 7544507838372.

The previous prime is 11316771849661. The next prime is 11316771849683. The reversal of 11316771849681 is 18694817761311.

It is a happy number.

The square root of 11316771849681 is 3364041.

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

11316771849681 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 67 + 7 + 1 + 8 + 496 + 81 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 11316771849681 - 2¹³ = 11316771841489 is a prime.

It is a super-2 number, since 2×11316771849681² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11316771849683) 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 8 ways as a sum of consecutive naturals, for example, 9531450 + ... + 10652796.

Almost surely, 2^{11316771849681} is an apocalyptic number.

11316771849681 is the 3364041-st square number.

11316771849681 is the 1682021-st centered octagonal number.

It is an amenable number.

11316771849681 is a deficient number, since it is larger than the sum of its proper divisors (5029690955160).

11316771849681 is an frugal number, since it uses more digits than its factorization.

11316771849681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242700 (or 1121350 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 11316771849681 in words is "eleven trillion, three hundred sixteen billion, seven hundred seventy-one million, eight hundred forty-nine thousand, six hundred eighty-one".