6601280729 has 2 divisors, whose sum is σ = 6601280730. Its totient is φ = 6601280728.

The previous prime is 6601280681. The next prime is 6601280753. The reversal of 6601280729 is 9270821066.

6601280729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3658435225 + 2942845504 = 60485^2 + 54248^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601280729 - 2¹⁶ = 6601215193 is a prime.

It is not a weakly prime, because it can be changed into another prime (6601283729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300640364 + 3300640365.

It is an arithmetic number, because the mean of its divisors is an integer number (3300640365).

Almost surely, 2^6601280729 is an apocalyptic number.

It is an amenable number.

6601280729 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601280729 is an equidigital number, since it uses as much as digits as its factorization.

6601280729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 6601280729 is about 81248.2660061124. The cubic root of 6601280729 is about 1875.8987789633.

The spelling of 6601280729 in words is "six billion, six hundred one million, two hundred eighty thousand, seven hundred twenty-nine".