1668520369 has 16 divisors (see below), whose sum is σ = 1793664000. Its totient is φ = 1546481664.

The previous prime is 1668520367. The next prime is 1668520391. The reversal of 1668520369 is 9630258661.

It is a cyclic number.

It is not a de Polignac number, because 1668520369 - 2¹ = 1668520367 is a prime.

It is a super-2 number, since 2×1668520369² = 5567920443535792322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668520367) 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 15 ways as a sum of consecutive naturals, for example, 601624 + ... + 604390.

It is an arithmetic number, because the mean of its divisors is an integer number (112104000).

Almost surely, 2^1668520369 is an apocalyptic number.

It is an amenable number.

1668520369 is a deficient number, since it is larger than the sum of its proper divisors (125143631).

1668520369 is a wasteful number, since it uses less digits than its factorization.

1668520369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 1668520369 is about 40847.5258614276. The cubic root of 1668520369 is about 1186.0705000620.

The spelling of 1668520369 in words is "one billion, six hundred sixty-eight million, five hundred twenty thousand, three hundred sixty-nine".