16521665527 has 2 divisors, whose sum is σ = 16521665528. Its totient is φ = 16521665526.

The previous prime is 16521665473. The next prime is 16521665549. The reversal of 16521665527 is 72556612561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16521665527 - 2⁷ = 16521665399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16521665227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260832763 + 8260832764.

It is an arithmetic number, because the mean of its divisors is an integer number (8260832764).

Almost surely, 2^16521665527 is an apocalyptic number.

16521665527 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521665527 is an equidigital number, since it uses as much as digits as its factorization.

16521665527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 46.

The spelling of 16521665527 in words is "sixteen billion, five hundred twenty-one million, six hundred sixty-five thousand, five hundred twenty-seven".