1668683701837 has 4 divisors (see below), whose sum is σ = 1668689273340. Its totient is φ = 1668678130336.

The previous prime is 1668683701823. The next prime is 1668683701891. The reversal of 1668683701837 is 7381073868661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 141121186921 + 1527562514916 = 375661^2 + 1235946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668683701837 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 (1668683701337) 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, 2309338 + ... + 2944555.

It is an arithmetic number, because the mean of its divisors is an integer number (417172318335).

Almost surely, 2^{1668683701837} is an apocalyptic number.

It is an amenable number.

1668683701837 is a deficient number, since it is larger than the sum of its proper divisors (5571503).

1668683701837 is an equidigital number, since it uses as much as digits as its factorization.

1668683701837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5571502.

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 1668683701837 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-three million, seven hundred one thousand, eight hundred thirty-seven".