2645205671 has 2 divisors, whose sum is σ = 2645205672. Its totient is φ = 2645205670.

The previous prime is 2645205659. The next prime is 2645205679. The reversal of 2645205671 is 1765025462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2645205671 - 2¹⁸ = 2644943527 is a prime.

It is a super-2 number, since 2×2645205671² = 13994226083781120482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645205679) 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, 1322602835 + 1322602836.

It is an arithmetic number, because the mean of its divisors is an integer number (1322602836).

Almost surely, 2^2645205671 is an apocalyptic number.

2645205671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645205671 is an equidigital number, since it uses as much as digits as its factorization.

2645205671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 2645205671 is about 51431.5629842221. The cubic root of 2645205671 is about 1382.9924685028.

The spelling of 2645205671 in words is "two billion, six hundred forty-five million, two hundred five thousand, six hundred seventy-one".