11766554681 has 12 divisors (see below), whose sum is σ = 13720161060. Its totient is φ = 10061644320.

The previous prime is 11766554663. The next prime is 11766554693. The reversal of 11766554681 is 18645566711.

It can be written as a sum of positive squares in 2 ways, for example, as 1206937081 + 10559617600 = 34741^2 + 102760^2 .

It is not a de Polignac number, because 11766554681 - 2¹⁴ = 11766538297 is a prime.

It is a super-2 number, since 2×11766554681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11766554581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264566 + ... + 305823.

It is an arithmetic number, because the mean of its divisors is an integer number (1143346755).

Almost surely, 2^11766554681 is an apocalyptic number.

It is an amenable number.

11766554681 is a deficient number, since it is larger than the sum of its proper divisors (1953606379).

11766554681 is an equidigital number, since it uses as much as digits as its factorization.

11766554681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570824 (or 570817 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The spelling of 11766554681 in words is "eleven billion, seven hundred sixty-six million, five hundred fifty-four thousand, six hundred eighty-one".