1681936640999 has 2 divisors, whose sum is σ = 1681936641000. Its totient is φ = 1681936640998.

The previous prime is 1681936640983. The next prime is 1681936641029. The reversal of 1681936640999 is 9990466391861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681936640999 - 2⁴ = 1681936640983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681936640099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840968320499 + 840968320500.

It is an arithmetic number, because the mean of its divisors is an integer number (840968320500).

Almost surely, 2^{1681936640999} is an apocalyptic number.

1681936640999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681936640999 is an equidigital number, since it uses as much as digits as its factorization.

1681936640999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136048896, while the sum is 71.

The spelling of 1681936640999 in words is "one trillion, six hundred eighty-one billion, nine hundred thirty-six million, six hundred forty thousand, nine hundred ninety-nine".