16869408509813 has 2 divisors, whose sum is σ = 16869408509814. Its totient is φ = 16869408509812.

The previous prime is 16869408509749. The next prime is 16869408509819. The reversal of 16869408509813 is 31890580496861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14013927016324 + 2855481493489 = 3743518^2 + 1689817^2 .

It is an emirp because it is prime and its reverse (31890580496861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16869408509813 - 2⁶ = 16869408509749 is a prime.

It is a super-2 number, since 2×16869408509813² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16869408509819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8434704254906 + 8434704254907.

It is an arithmetic number, because the mean of its divisors is an integer number (8434704254907).

Almost surely, 2^{16869408509813} is an apocalyptic number.

It is an amenable number.

16869408509813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16869408509813 is an equidigital number, since it uses as much as digits as its factorization.

16869408509813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89579520, while the sum is 68.

The spelling of 16869408509813 in words is "sixteen trillion, eight hundred sixty-nine billion, four hundred eight million, five hundred nine thousand, eight hundred thirteen".