6421980193 has 2 divisors, whose sum is σ = 6421980194. Its totient is φ = 6421980192.

The previous prime is 6421980137. The next prime is 6421980223. The reversal of 6421980193 is 3910891246.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5494960384 + 927019809 = 74128^2 + 30447^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421980193 - 2¹³ = 6421972001 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421980293) 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, 3210990096 + 3210990097.

It is an arithmetic number, because the mean of its divisors is an integer number (3210990097).

Almost surely, 2^6421980193 is an apocalyptic number.

It is an amenable number.

6421980193 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421980193 is an equidigital number, since it uses as much as digits as its factorization.

6421980193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 6421980193 is about 80137.2584569749. The cubic root of 6421980193 is about 1858.7585843743.

The spelling of 6421980193 in words is "six billion, four hundred twenty-one million, nine hundred eighty thousand, one hundred ninety-three".