6445989741871 has 2 divisors, whose sum is σ = 6445989741872. Its totient is φ = 6445989741870.

The previous prime is 6445989741859. The next prime is 6445989741881. The reversal of 6445989741871 is 1781479895446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6445989741871 - 2⁴¹ = 4246966486319 is a prime.

It is a super-2 number, since 2×6445989741871² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6445989741794 and 6445989741803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445989741881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222994870935 + 3222994870936.

It is an arithmetic number, because the mean of its divisors is an integer number (3222994870936).

Almost surely, 2^{6445989741871} is an apocalyptic number.

6445989741871 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445989741871 is an equidigital number, since it uses as much as digits as its factorization.

6445989741871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 487710720, while the sum is 73.

The spelling of 6445989741871 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty-one thousand, eight hundred seventy-one".