1668533535 has 12 divisors (see below), whose sum is σ = 2892124872. Its totient is φ = 889884528.

The previous prime is 1668533533. The next prime is 1668533557. The reversal of 1668533535 is 5353358661.

It is a happy number.

1668533535 is a `hidden beast` number, since 1 + 6 + 6 + 85 + 33 + 535 = 666.

It is not a de Polignac number, because 1668533535 - 2¹ = 1668533533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 37078523 = 1668533535 / (1 + 6 + 6 + 8 + 5 + 3 + 3 + 5 + 3 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668533533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18539217 + ... + 18539306.

It is an arithmetic number, because the mean of its divisors is an integer number (241010406).

Almost surely, 2^1668533535 is an apocalyptic number.

1668533535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668533535 is a deficient number, since it is larger than the sum of its proper divisors (1223591337).

1668533535 is a wasteful number, since it uses less digits than its factorization.

1668533535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37078534 (or 37078531 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1668533535 is about 40847.6870214214. The cubic root of 1668533535 is about 1186.0736197448.

The spelling of 1668533535 in words is "one billion, six hundred sixty-eight million, five hundred thirty-three thousand, five hundred thirty-five".