16861637691341 has 2 divisors, whose sum is σ = 16861637691342. Its totient is φ = 16861637691340.

The previous prime is 16861637691307. The next prime is 16861637691443. The reversal of 16861637691341 is 14319673616861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10459700349316 + 6401937342025 = 3234146^2 + 2530205^2 .

It is a cyclic number.

It is not a de Polignac number, because 16861637691341 - 2²⁶ = 16861570582477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16861637696341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430818845670 + 8430818845671.

It is an arithmetic number, because the mean of its divisors is an integer number (8430818845671).

Almost surely, 2^{16861637691341} is an apocalyptic number.

It is an amenable number.

16861637691341 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861637691341 is an equidigital number, since it uses as much as digits as its factorization.

16861637691341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 62.

The spelling of 16861637691341 in words is "sixteen trillion, eight hundred sixty-one billion, six hundred thirty-seven million, six hundred ninety-one thousand, three hundred forty-one".