1668353517 has 20 divisors (see below), whose sum is σ = 2550196000. Its totient is φ = 1086367464.

The previous prime is 1668353471. The next prime is 1668353543. The reversal of 1668353517 is 7153538661.

1668353517 is a `hidden beast` number, since 1 + 6 + 6 + 83 + 53 + 517 = 666.

It is not a de Polignac number, because 1668353517 - 2⁷ = 1668353389 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 (1668353117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 236017 + ... + 242982.

It is an arithmetic number, because the mean of its divisors is an integer number (127509800).

Almost surely, 2^1668353517 is an apocalyptic number.

It is an amenable number.

1668353517 is a deficient number, since it is larger than the sum of its proper divisors (881842483).

1668353517 is an equidigital number, since it uses as much as digits as its factorization.

1668353517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479054 (or 479045 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1668353517 is about 40845.4834345243. The cubic root of 1668353517 is about 1186.0309630694.

The spelling of 1668353517 in words is "one billion, six hundred sixty-eight million, three hundred fifty-three thousand, five hundred seventeen".