6421673969 has 2 divisors, whose sum is σ = 6421673970. Its totient is φ = 6421673968.

The previous prime is 6421673953. The next prime is 6421673977. The reversal of 6421673969 is 9693761246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6269472400 + 152201569 = 79180^2 + 12337^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421673969 - 2⁴ = 6421673953 is a prime.

It is a super-2 number, since 2×6421673969² = 82475793128264425922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6421673969.

It is not a weakly prime, because it can be changed into another prime (6421673939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210836984 + 3210836985.

It is an arithmetic number, because the mean of its divisors is an integer number (3210836985).

Almost surely, 2^6421673969 is an apocalyptic number.

It is an amenable number.

6421673969 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421673969 is an equidigital number, since it uses as much as digits as its factorization.

6421673969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 53.

The square root of 6421673969 is about 80135.3478123106. The cubic root of 6421673969 is about 1858.7290397209.

The spelling of 6421673969 in words is "six billion, four hundred twenty-one million, six hundred seventy-three thousand, nine hundred sixty-nine".