1668307797 has 24 divisors (see below), whose sum is σ = 2598975288. Its totient is φ = 1025136000.

The previous prime is 1668307793. The next prime is 1668307807. The reversal of 1668307797 is 7977038661.

It can be written as a sum of positive squares in 4 ways, for example, as 334670436 + 1333637361 = 18294^2 + 36519^2 .

It is not a de Polignac number, because 1668307797 - 2² = 1668307793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668307793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71847 + ... + 92187.

It is an arithmetic number, because the mean of its divisors is an integer number (108290637).

Almost surely, 2^1668307797 is an apocalyptic number.

It is an amenable number.

1668307797 is a deficient number, since it is larger than the sum of its proper divisors (930667491).

1668307797 is a wasteful number, since it uses less digits than its factorization.

1668307797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21061 (or 21058 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The square root of 1668307797 is about 40844.9237604871. The cubic root of 1668307797 is about 1186.0201288687.

The spelling of 1668307797 in words is "one billion, six hundred sixty-eight million, three hundred seven thousand, seven hundred ninety-seven".