1681994012207 has 2 divisors, whose sum is σ = 1681994012208. Its totient is φ = 1681994012206.

The previous prime is 1681994012123. The next prime is 1681994012249. The reversal of 1681994012207 is 7022104991861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681994012207 - 2¹⁶ = 1681993946671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681994012297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840997006103 + 840997006104.

It is an arithmetic number, because the mean of its divisors is an integer number (840997006104).

Almost surely, 2^{1681994012207} is an apocalyptic number.

1681994012207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681994012207 is an equidigital number, since it uses as much as digits as its factorization.

1681994012207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 1681994012207 in words is "one trillion, six hundred eighty-one billion, nine hundred ninety-four million, twelve thousand, two hundred seven".