1688969054849 has 2 divisors, whose sum is σ = 1688969054850. Its totient is φ = 1688969054848.

The previous prime is 1688969054833. The next prime is 1688969054897. The reversal of 1688969054849 is 9484509698861.

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., 900709189249 + 788259865600 = 949057^2 + 887840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688969054849 - 2⁴ = 1688969054833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1688969054849.

It is not a weakly prime, because it can be changed into another prime (1688969054819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844484527424 + 844484527425.

It is an arithmetic number, because the mean of its divisors is an integer number (844484527425).

Almost surely, 2^{1688969054849} is an apocalyptic number.

It is an amenable number.

1688969054849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688969054849 is an equidigital number, since it uses as much as digits as its factorization.

1688969054849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1074954240, while the sum is 77.

The spelling of 1688969054849 in words is "one trillion, six hundred eighty-eight billion, nine hundred sixty-nine million, fifty-four thousand, eight hundred forty-nine".