1681437919717 has 4 divisors (see below), whose sum is σ = 1681482460000. Its totient is φ = 1681393379436.

The previous prime is 1681437919699. The next prime is 1681437919841. The reversal of 1681437919717 is 7179197341861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681437919717 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 (1681437919417) 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, 22213467 + ... + 22289032.

It is an arithmetic number, because the mean of its divisors is an integer number (420370615000).

Almost surely, 2^{1681437919717} is an apocalyptic number.

It is an amenable number.

1681437919717 is a deficient number, since it is larger than the sum of its proper divisors (44540283).

1681437919717 is an equidigital number, since it uses as much as digits as its factorization.

1681437919717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44540282.

The product of its digits is 16003008, while the sum is 64.

The spelling of 1681437919717 in words is "one trillion, six hundred eighty-one billion, four hundred thirty-seven million, nine hundred nineteen thousand, seven hundred seventeen".