1689809189927 has 2 divisors, whose sum is σ = 1689809189928. Its totient is φ = 1689809189926.

The previous prime is 1689809189897. The next prime is 1689809189947. The reversal of 1689809189927 is 7299819089861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1689809189927 - 2¹⁸ = 1689808927783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689809189947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844904594963 + 844904594964.

It is an arithmetic number, because the mean of its divisors is an integer number (844904594964).

Almost surely, 2^{1689809189927} is an apocalyptic number.

1689809189927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689809189927 is an equidigital number, since it uses as much as digits as its factorization.

1689809189927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282175488, while the sum is 77.

The spelling of 1689809189927 in words is "one trillion, six hundred eighty-nine billion, eight hundred nine million, one hundred eighty-nine thousand, nine hundred twenty-seven".