16851866687 has 2 divisors, whose sum is σ = 16851866688. Its totient is φ = 16851866686.

The previous prime is 16851866683. The next prime is 16851866741. The reversal of 16851866687 is 78666815861.

It is a weak prime.

It is an emirp because it is prime and its reverse (78666815861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16851866687 - 2² = 16851866683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16851866683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425933343 + 8425933344.

It is an arithmetic number, because the mean of its divisors is an integer number (8425933344).

Almost surely, 2^16851866687 is an apocalyptic number.

16851866687 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851866687 is an equidigital number, since it uses as much as digits as its factorization.

16851866687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23224320, while the sum is 62.

The spelling of 16851866687 in words is "sixteen billion, eight hundred fifty-one million, eight hundred sixty-six thousand, six hundred eighty-seven".