2066625671221 has 2 divisors, whose sum is σ = 2066625671222. Its totient is φ = 2066625671220.

The previous prime is 2066625671213. The next prime is 2066625671233. The reversal of 2066625671221 is 1221765266602.

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., 1967328838225 + 99296832996 = 1402615^2 + 315114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066625671221 - 2³ = 2066625671213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2066625671281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033312835610 + 1033312835611.

It is an arithmetic number, because the mean of its divisors is an integer number (1033312835611).

Almost surely, 2^{2066625671221} is an apocalyptic number.

It is an amenable number.

2066625671221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066625671221 is an equidigital number, since it uses as much as digits as its factorization.

2066625671221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 2066625671221 in words is "two trillion, sixty-six billion, six hundred twenty-five million, six hundred seventy-one thousand, two hundred twenty-one".