2661659501 has 2 divisors, whose sum is σ = 2661659502. Its totient is φ = 2661659500.

The previous prime is 2661659477. The next prime is 2661659503. The reversal of 2661659501 is 1059561662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2592337225 + 69322276 = 50915^2 + 8326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661659501 is a prime.

It is a Sophie Germain prime.

Together with 2661659503, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661659503) 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, 1330829750 + 1330829751.

It is an arithmetic number, because the mean of its divisors is an integer number (1330829751).

Almost surely, 2^2661659501 is an apocalyptic number.

It is an amenable number.

2661659501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661659501 is an equidigital number, since it uses as much as digits as its factorization.

2661659501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 2661659501 is about 51591.2734965905. The cubic root of 2661659501 is about 1385.8540611998.

The spelling of 2661659501 in words is "two billion, six hundred sixty-one million, six hundred fifty-nine thousand, five hundred one".