2661938273 has 2 divisors, whose sum is σ = 2661938274. Its totient is φ = 2661938272.

The previous prime is 2661938261. The next prime is 2661938299. The reversal of 2661938273 is 3728391662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2574852049 + 87086224 = 50743^2 + 9332^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661938273 - 2¹⁰ = 2661937249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661538273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330969136 + 1330969137.

It is an arithmetic number, because the mean of its divisors is an integer number (1330969137).

Almost surely, 2^2661938273 is an apocalyptic number.

It is an amenable number.

2661938273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661938273 is an equidigital number, since it uses as much as digits as its factorization.

2661938273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 2661938273 is about 51593.9751618345. The cubic root of 2661938273 is about 1385.9024425224.

The spelling of 2661938273 in words is "two billion, six hundred sixty-one million, nine hundred thirty-eight thousand, two hundred seventy-three".