16605257687 has 2 divisors, whose sum is σ = 16605257688. Its totient is φ = 16605257686.

The previous prime is 16605257657. The next prime is 16605257693. The reversal of 16605257687 is 78675250661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16605257687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16605257657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302628843 + 8302628844.

It is an arithmetic number, because the mean of its divisors is an integer number (8302628844).

Almost surely, 2^16605257687 is an apocalyptic number.

16605257687 is a deficient number, since it is larger than the sum of its proper divisors (1).

16605257687 is an equidigital number, since it uses as much as digits as its factorization.

16605257687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 16605257687 in words is "sixteen billion, six hundred five million, two hundred fifty-seven thousand, six hundred eighty-seven".