11166531061 has 12 divisors (see below), whose sum is σ = 12994056300. Its totient is φ = 9568056960.

The previous prime is 11166531053. The next prime is 11166531071. The reversal of 11166531061 is 16013566111.

It can be written as a sum of positive squares in 2 ways, for example, as 5733366961 + 5433164100 = 75719^2 + 73710^2 .

It is not a de Polignac number, because 11166531061 - 2³ = 11166531053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11166531071) 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, 112765 + ... + 187213.

It is an arithmetic number, because the mean of its divisors is an integer number (1082838025).

Almost surely, 2^11166531061 is an apocalyptic number.

It is an amenable number.

11166531061 is a deficient number, since it is larger than the sum of its proper divisors (1827525239).

11166531061 is an equidigital number, since it uses as much as digits as its factorization.

11166531061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77524 (or 77517 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The spelling of 11166531061 in words is "eleven billion, one hundred sixty-six million, five hundred thirty-one thousand, sixty-one".