1668453471 has 20 divisors (see below), whose sum is σ = 2526532272. Its totient is φ = 1097061408.

The previous prime is 1668453463. The next prime is 1668453539. The reversal of 1668453471 is 1743548661.

It is not a de Polignac number, because 1668453471 - 2³ = 1668453463 is a prime.

It is a super-3 number, since 3×1668453471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668453071) 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, 135171 + ... + 146996.

Almost surely, 2^1668453471 is an apocalyptic number.

1668453471 is a deficient number, since it is larger than the sum of its proper divisors (858078801).

1668453471 is an equidigital number, since it uses as much as digits as its factorization.

1668453471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282252 (or 282243 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 1668453471 is about 40846.7069786537. The cubic root of 1668453471 is about 1186.0546483316.

The spelling of 1668453471 in words is "one billion, six hundred sixty-eight million, four hundred fifty-three thousand, four hundred seventy-one".