2661659129 has 2 divisors, whose sum is σ = 2661659130. Its totient is φ = 2661659128.

The previous prime is 2661659089. The next prime is 2661659131. The reversal of 2661659129 is 9219561662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2104699129 + 556960000 = 45877^2 + 23600^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661659129 - 2²⁰ = 2660610553 is a prime.

Together with 2661659131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2661659159) 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 as a sum of consecutive naturals, namely, 1330829564 + 1330829565.

It is an arithmetic number, because the mean of its divisors is an integer number (1330829565).

Almost surely, 2^2661659129 is an apocalyptic number.

It is an amenable number.

2661659129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661659129 is an equidigital number, since it uses as much as digits as its factorization.

2661659129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 2661659129 is about 51591.2698913295. The cubic root of 2661659129 is about 1385.8539966363.

The spelling of 2661659129 in words is "two billion, six hundred sixty-one million, six hundred fifty-nine thousand, one hundred twenty-nine".