1668323197 has 4 divisors (see below), whose sum is σ = 1671373696. Its totient is φ = 1665272700.

The previous prime is 1668323191. The next prime is 1668323201. The reversal of 1668323197 is 7913238661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7913238661 = 41 ⋅193005821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668323197 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 (1668323191) 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, 1524429 + ... + 1525522.

It is an arithmetic number, because the mean of its divisors is an integer number (417843424).

Almost surely, 2^1668323197 is an apocalyptic number.

It is an amenable number.

1668323197 is a deficient number, since it is larger than the sum of its proper divisors (3050499).

1668323197 is an equidigital number, since it uses as much as digits as its factorization.

1668323197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050498.

The product of its digits is 326592, while the sum is 46.

The square root of 1668323197 is about 40845.1122779703. The cubic root of 1668323197 is about 1186.0237782060.

The spelling of 1668323197 in words is "one billion, six hundred sixty-eight million, three hundred twenty-three thousand, one hundred ninety-seven".