6421673953 has 2 divisors, whose sum is σ = 6421673954. Its totient is φ = 6421673952.

The previous prime is 6421673939. The next prime is 6421673969. The reversal of 6421673953 is 3593761246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3375958609 + 3045715344 = 58103^2 + 55188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421673953 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421673053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210836976 + 3210836977.

It is an arithmetic number, because the mean of its divisors is an integer number (3210836977).

Almost surely, 2^6421673953 is an apocalyptic number.

It is an amenable number.

6421673953 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421673953 is an equidigital number, since it uses as much as digits as its factorization.

6421673953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 46.

The square root of 6421673953 is about 80135.3477124795. The cubic root of 6421673953 is about 1858.7290381772.

The spelling of 6421673953 in words is "six billion, four hundred twenty-one million, six hundred seventy-three thousand, nine hundred fifty-three".