16878643669 has 2 divisors, whose sum is σ = 16878643670. Its totient is φ = 16878643668.

The previous prime is 16878643601. The next prime is 16878643693. The reversal of 16878643669 is 96634687861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13667948100 + 3210695569 = 116910^2 + 56663^2 .

It is an emirp because it is prime and its reverse (96634687861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16878643669 - 2⁹ = 16878643157 is a prime.

It is a super-2 number, since 2×16878643669² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16878643669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16878043669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8439321834 + 8439321835.

It is an arithmetic number, because the mean of its divisors is an integer number (8439321835).

Almost surely, 2^16878643669 is an apocalyptic number.

It is an amenable number.

16878643669 is a deficient number, since it is larger than the sum of its proper divisors (1).

16878643669 is an equidigital number, since it uses as much as digits as its factorization.

16878643669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62705664, while the sum is 64.

The spelling of 16878643669 in words is "sixteen billion, eight hundred seventy-eight million, six hundred forty-three thousand, six hundred sixty-nine".