6553426721 has 2 divisors, whose sum is σ = 6553426722. Its totient is φ = 6553426720.

The previous prime is 6553426709. The next prime is 6553426741. The reversal of 6553426721 is 1276243556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3379794496 + 3173632225 = 58136^2 + 56335^2 .

It is a cyclic number.

It is not a de Polignac number, because 6553426721 - 2⁶ = 6553426657 is a prime.

It is not a weakly prime, because it can be changed into another prime (6553426741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3276713360 + 3276713361.

It is an arithmetic number, because the mean of its divisors is an integer number (3276713361).

Almost surely, 2^6553426721 is an apocalyptic number.

It is an amenable number.

6553426721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6553426721 is an equidigital number, since it uses as much as digits as its factorization.

6553426721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 6553426721 is about 80953.2378660669. The cubic root of 6553426721 is about 1871.3548591185.

The spelling of 6553426721 in words is "six billion, five hundred fifty-three million, four hundred twenty-six thousand, seven hundred twenty-one".