16236525521 has 2 divisors, whose sum is σ = 16236525522. Its totient is φ = 16236525520.

The previous prime is 16236525499. The next prime is 16236525523. The reversal of 16236525521 is 12552563261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15855846400 + 380679121 = 125920^2 + 19511^2 .

It is a cyclic number.

It is not a de Polignac number, because 16236525521 - 2¹⁰ = 16236524497 is a prime.

Together with 16236525523, 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 (16236525523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8118262760 + 8118262761.

It is an arithmetic number, because the mean of its divisors is an integer number (8118262761).

Almost surely, 2^16236525521 is an apocalyptic number.

It is an amenable number.

16236525521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16236525521 is an equidigital number, since it uses as much as digits as its factorization.

16236525521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

The spelling of 16236525521 in words is "sixteen billion, two hundred thirty-six million, five hundred twenty-five thousand, five hundred twenty-one".