1668748871 has 8 divisors (see below), whose sum is σ = 1682634624. Its totient is φ = 1654880760.

The previous prime is 1668748819. The next prime is 1668748889. The reversal of 1668748871 is 1788478661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668748871 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 (1668738871) 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 7 ways as a sum of consecutive naturals, for example, 241166 + ... + 247988.

It is an arithmetic number, because the mean of its divisors is an integer number (210329328).

Almost surely, 2^1668748871 is an apocalyptic number.

1668748871 is a deficient number, since it is larger than the sum of its proper divisors (13885753).

1668748871 is a wasteful number, since it uses less digits than its factorization.

1668748871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821.

The product of its digits is 3612672, while the sum is 56.

The square root of 1668748871 is about 40850.3227771826. The cubic root of 1668748871 is about 1186.1246412670.

The spelling of 1668748871 in words is "one billion, six hundred sixty-eight million, seven hundred forty-eight thousand, eight hundred seventy-one".