16421767066589 has 2 divisors, whose sum is σ = 16421767066590. Its totient is φ = 16421767066588.

The previous prime is 16421767066577. The next prime is 16421767066619. The reversal of 16421767066589 is 98566076712461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14982086248900 + 1439680817689 = 3870670^2 + 1199867^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421767066589 - 2²⁸ = 16421498631133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16421767066559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210883533294 + 8210883533295.

It is an arithmetic number, because the mean of its divisors is an integer number (8210883533295).

Almost surely, 2^{16421767066589} is an apocalyptic number.

It is an amenable number.

16421767066589 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421767066589 is an equidigital number, since it uses as much as digits as its factorization.

16421767066589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 16421767066589 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred sixty-seven million, sixty-six thousand, five hundred eighty-nine".