6194921881639 has 2 divisors, whose sum is σ = 6194921881640. Its totient is φ = 6194921881638.

The previous prime is 6194921881567. The next prime is 6194921881679. The reversal of 6194921881639 is 9361881294916.

6194921881639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6194921881639 - 2¹³ = 6194921873447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6194921881679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3097460940819 + 3097460940820.

It is an arithmetic number, because the mean of its divisors is an integer number (3097460940820).

Almost surely, 2^{6194921881639} is an apocalyptic number.

6194921881639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6194921881639 is an equidigital number, since it uses as much as digits as its factorization.

6194921881639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40310784, while the sum is 67.

The spelling of 6194921881639 in words is "six trillion, one hundred ninety-four billion, nine hundred twenty-one million, eight hundred eighty-one thousand, six hundred thirty-nine".