6753998621 has 2 divisors, whose sum is σ = 6753998622. Its totient is φ = 6753998620.

The previous prime is 6753998597. The next prime is 6753998633. The reversal of 6753998621 is 1268993576.

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., 5316451396 + 1437547225 = 72914^2 + 37915^2 .

It is a cyclic number.

It is not a de Polignac number, because 6753998621 - 2¹⁰ = 6753997597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6753992621) 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, 3376999310 + 3376999311.

It is an arithmetic number, because the mean of its divisors is an integer number (3376999311).

Almost surely, 2^6753998621 is an apocalyptic number.

It is an amenable number.

6753998621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6753998621 is an equidigital number, since it uses as much as digits as its factorization.

6753998621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 56.

The square root of 6753998621 is about 82182.7148553758. The cubic root of 6753998621 is about 1890.2546824193.

The spelling of 6753998621 in words is "six billion, seven hundred fifty-three million, nine hundred ninety-eight thousand, six hundred twenty-one".