16521864929287 has 2 divisors, whose sum is σ = 16521864929288. Its totient is φ = 16521864929286.

The previous prime is 16521864929257. The next prime is 16521864929357. The reversal of 16521864929287 is 78292946812561.

16521864929287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (16521864929357) can be obtained adding 16521864929287 to its sum of digits (70).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16521864929287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16521864929257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260932464643 + 8260932464644.

It is an arithmetic number, because the mean of its divisors is an integer number (8260932464644).

Almost surely, 2^{16521864929287} is an apocalyptic number.

16521864929287 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521864929287 is an equidigital number, since it uses as much as digits as its factorization.

16521864929287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 70.

The spelling of 16521864929287 in words is "sixteen trillion, five hundred twenty-one billion, eight hundred sixty-four million, nine hundred twenty-nine thousand, two hundred eighty-seven".