1768198694681 has 4 divisors (see below), whose sum is σ = 1805819943552. Its totient is φ = 1730577445812.

The previous prime is 1768198694663. The next prime is 1768198694687. The reversal of 1768198694681 is 1864968918671.

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 not a de Polignac number, because 1768198694681 - 2¹⁴ = 1768198678297 is a prime.

It is a super-2 number, since 2×1768198694681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1768198694599 and 1768198694608.

It is not an unprimeable number, because it can be changed into a prime (1768198694687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18810624365 + ... + 18810624458.

It is an arithmetic number, because the mean of its divisors is an integer number (451454985888).

Almost surely, 2^{1768198694681} is an apocalyptic number.

It is an amenable number.

1768198694681 is a deficient number, since it is larger than the sum of its proper divisors (37621248871).

1768198694681 is an equidigital number, since it uses as much as digits as its factorization.

1768198694681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37621248870.

The product of its digits is 250822656, while the sum is 74.

The spelling of 1768198694681 in words is "one trillion, seven hundred sixty-eight billion, one hundred ninety-eight million, six hundred ninety-four thousand, six hundred eighty-one".