1668794801 has 2 divisors, whose sum is σ = 1668794802. Its totient is φ = 1668794800.

The previous prime is 1668794797. The next prime is 1668794857. The reversal of 1668794801 is 1084978661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174844176 + 493950625 = 34276^2 + 22225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668794801 - 2² = 1668794797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668794801.

It is not a weakly prime, because it can be changed into another prime (1668794861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834397400 + 834397401.

It is an arithmetic number, because the mean of its divisors is an integer number (834397401).

Almost surely, 2^1668794801 is an apocalyptic number.

It is an amenable number.

1668794801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668794801 is an equidigital number, since it uses as much as digits as its factorization.

1668794801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1668794801 is about 40850.8849475749. The cubic root of 1668794801 is about 1186.1355233128.

The spelling of 1668794801 in words is "one billion, six hundred sixty-eight million, seven hundred ninety-four thousand, eight hundred one".