1668685206337 has 2 divisors, whose sum is σ = 1668685206338. Its totient is φ = 1668685206336.

The previous prime is 1668685206323. The next prime is 1668685206341. The reversal of 1668685206337 is 7336025868661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1038623918641 + 630061287696 = 1019129^2 + 793764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668685206337 - 2²³ = 1668676817729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668685206137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834342603168 + 834342603169.

It is an arithmetic number, because the mean of its divisors is an integer number (834342603169).

Almost surely, 2^{1668685206337} is an apocalyptic number.

It is an amenable number.

1668685206337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668685206337 is an equidigital number, since it uses as much as digits as its factorization.

1668685206337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 61.

The spelling of 1668685206337 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-five million, two hundred six thousand, three hundred thirty-seven".