2661659191 has 2 divisors, whose sum is σ = 2661659192. Its totient is φ = 2661659190.

The previous prime is 2661659159. The next prime is 2661659239. The reversal of 2661659191 is 1919561662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661659191 - 2⁵ = 2661659159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661659131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330829595 + 1330829596.

It is an arithmetic number, because the mean of its divisors is an integer number (1330829596).

Almost surely, 2^2661659191 is an apocalyptic number.

2661659191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661659191 is an equidigital number, since it uses as much as digits as its factorization.

2661659191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 2661659191 is about 51591.2704922063. The cubic root of 2661659191 is about 1385.8540073969.

The spelling of 2661659191 in words is "two billion, six hundred sixty-one million, six hundred fifty-nine thousand, one hundred ninety-one".