6445989739811 has 2 divisors, whose sum is σ = 6445989739812. Its totient is φ = 6445989739810.

The previous prime is 6445989739793. The next prime is 6445989739907. The reversal of 6445989739811 is 1189379895446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6445989739811 - 2⁶ = 6445989739747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6445989732811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222994869905 + 3222994869906.

It is an arithmetic number, because the mean of its divisors is an integer number (3222994869906).

Almost surely, 2^{6445989739811} is an apocalyptic number.

6445989739811 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445989739811 is an equidigital number, since it uses as much as digits as its factorization.

6445989739811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 74.

The spelling of 6445989739811 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred thirty-nine thousand, eight hundred eleven".