2566121671 has 2 divisors, whose sum is σ = 2566121672. Its totient is φ = 2566121670.

The previous prime is 2566121669. The next prime is 2566121683. The reversal of 2566121671 is 1761216652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2566121671 - 2¹ = 2566121669 is a prime.

Together with 2566121669, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2566121671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2566121071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283060835 + 1283060836.

It is an arithmetic number, because the mean of its divisors is an integer number (1283060836).

Almost surely, 2^2566121671 is an apocalyptic number.

2566121671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566121671 is an equidigital number, since it uses as much as digits as its factorization.

2566121671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 2566121671 is about 50656.9015140089. The cubic root of 2566121671 is about 1369.0702966473.

The spelling of 2566121671 in words is "two billion, five hundred sixty-six million, one hundred twenty-one thousand, six hundred seventy-one".