16330257521 has 2 divisors, whose sum is σ = 16330257522. Its totient is φ = 16330257520.

The previous prime is 16330257509. The next prime is 16330257523. The reversal of 16330257521 is 12575203361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9305303296 + 7024954225 = 96464^2 + 83815^2 .

It is a cyclic number.

It is not a de Polignac number, because 16330257521 - 2⁶ = 16330257457 is a prime.

Together with 16330257523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16330257523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165128760 + 8165128761.

It is an arithmetic number, because the mean of its divisors is an integer number (8165128761).

Almost surely, 2^16330257521 is an apocalyptic number.

It is an amenable number.

16330257521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16330257521 is an equidigital number, since it uses as much as digits as its factorization.

16330257521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 16330257521 in words is "sixteen billion, three hundred thirty million, two hundred fifty-seven thousand, five hundred twenty-one".