1668486397 has 4 divisors (see below), whose sum is σ = 1668899520. Its totient is φ = 1668073276.

The previous prime is 1668486373. The next prime is 1668486409. The reversal of 1668486397 is 7936848661.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668486397 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 (1668496397) 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, 200443 + ... + 208600.

It is an arithmetic number, because the mean of its divisors is an integer number (417224880).

Almost surely, 2^1668486397 is an apocalyptic number.

It is an amenable number.

1668486397 is a deficient number, since it is larger than the sum of its proper divisors (413123).

1668486397 is an equidigital number, since it uses as much as digits as its factorization.

1668486397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413122.

The product of its digits is 10450944, while the sum is 58.

The square root of 1668486397 is about 40847.1100201716. The cubic root of 1668486397 is about 1186.0624503230.

The spelling of 1668486397 in words is "one billion, six hundred sixty-eight million, four hundred eighty-six thousand, three hundred ninety-seven".