1688794866133 has 4 divisors (see below), whose sum is σ = 1689409199500. Its totient is φ = 1688180532768.

The previous prime is 1688794866103. The next prime is 1688794866169. The reversal of 1688794866133 is 3316684978861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1098758879089 + 590035987044 = 1048217^2 + 768138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688794866133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688794866103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307162560 + ... + 307168057.

It is an arithmetic number, because the mean of its divisors is an integer number (422352299875).

Almost surely, 2^{1688794866133} is an apocalyptic number.

It is an amenable number.

1688794866133 is a deficient number, since it is larger than the sum of its proper divisors (614333367).

1688794866133 is an equidigital number, since it uses as much as digits as its factorization.

1688794866133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614333366.

The product of its digits is 250822656, while the sum is 70.

The spelling of 1688794866133 in words is "one trillion, six hundred eighty-eight billion, seven hundred ninety-four million, eight hundred sixty-six thousand, one hundred thirty-three".