2640388273 has 2 divisors, whose sum is σ = 2640388274. Its totient is φ = 2640388272.

The previous prime is 2640388271. The next prime is 2640388277. The reversal of 2640388273 is 3728830462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359249424 + 1281138849 = 36868^2 + 35793^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640388273 - 2¹ = 2640388271 is a prime.

Together with 2640388271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2640388271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320194136 + 1320194137.

It is an arithmetic number, because the mean of its divisors is an integer number (1320194137).

Almost surely, 2^2640388273 is an apocalyptic number.

It is an amenable number.

2640388273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640388273 is an equidigital number, since it uses as much as digits as its factorization.

2640388273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 2640388273 is about 51384.7085522532. The cubic root of 2640388273 is about 1382.1523985081.

The spelling of 2640388273 in words is "two billion, six hundred forty million, three hundred eighty-eight thousand, two hundred seventy-three".