5611666729 has 4 divisors (see below), whose sum is σ = 5663150020. Its totient is φ = 5560183440.

The previous prime is 5611666693. The next prime is 5611666733. The reversal of 5611666729 is 9276661165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9276661165 = 5 ⋅1855332233.

It can be written as a sum of positive squares in 2 ways, for example, as 4549232704 + 1062434025 = 67448^2 + 32595^2 .

It is a cyclic number.

It is not a de Polignac number, because 5611666729 - 2²⁷ = 5477449001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5611666829) 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 3 ways as a sum of consecutive naturals, for example, 25741482 + ... + 25741699.

It is an arithmetic number, because the mean of its divisors is an integer number (1415787505).

Almost surely, 2^5611666729 is an apocalyptic number.

It is an amenable number.

5611666729 is a deficient number, since it is larger than the sum of its proper divisors (51483291).

5611666729 is a wasteful number, since it uses less digits than its factorization.

5611666729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51483290.

The product of its digits is 816480, while the sum is 49.

The square root of 5611666729 is about 74911.0587897408. The cubic root of 5611666729 is about 1777.0403546682.

The spelling of 5611666729 in words is "five billion, six hundred eleven million, six hundred sixty-six thousand, seven hundred twenty-nine".