2660654221 has 2 divisors, whose sum is σ = 2660654222. Its totient is φ = 2660654220.

The previous prime is 2660654179. The next prime is 2660654231. The reversal of 2660654221 is 1224560662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2245717321 + 414936900 = 47389^2 + 20370^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660654221 - 2⁷ = 2660654093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2660654231) 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, 1330327110 + 1330327111.

It is an arithmetic number, because the mean of its divisors is an integer number (1330327111).

Almost surely, 2^2660654221 is an apocalyptic number.

It is an amenable number.

2660654221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660654221 is an equidigital number, since it uses as much as digits as its factorization.

2660654221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 2660654221 is about 51581.5298435399. The cubic root of 2660654221 is about 1385.6795652005.

The spelling of 2660654221 in words is "two billion, six hundred sixty million, six hundred fifty-four thousand, two hundred twenty-one".