1681269186937 has 2 divisors, whose sum is σ = 1681269186938. Its totient is φ = 1681269186936.

The previous prime is 1681269186929. The next prime is 1681269186959. The reversal of 1681269186937 is 7396819621861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1660685832976 + 20583353961 = 1288676^2 + 143469^2 .

It is an emirp because it is prime and its reverse (7396819621861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1681269186937 - 2³ = 1681269186929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681269181937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840634593468 + 840634593469.

It is an arithmetic number, because the mean of its divisors is an integer number (840634593469).

Almost surely, 2^{1681269186937} is an apocalyptic number.

It is an amenable number.

1681269186937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681269186937 is an equidigital number, since it uses as much as digits as its factorization.

1681269186937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 67.

The spelling of 1681269186937 in words is "one trillion, six hundred eighty-one billion, two hundred sixty-nine million, one hundred eighty-six thousand, nine hundred thirty-seven".