1668064920 has 128 divisors (see below), whose sum is σ = 5217696000. Its totient is φ = 426083840.

The previous prime is 1668064883. The next prime is 1668064961. The reversal of 1668064920 is 294608661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454051 + ... + 457709.

It is an arithmetic number, because the mean of its divisors is an integer number (40763250).

Almost surely, 2^1668064920 is an apocalyptic number.

1668064920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668064920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2608848000).

1668064920 is an abundant number, since it is smaller than the sum of its proper divisors (3549631080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668064920 is a wasteful number, since it uses less digits than its factorization.

1668064920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833 (or 3829 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1668064920 is about 40841.9504921104. The cubic root of 1668064920 is about 1185.9625713462.

The spelling of 1668064920 in words is "one billion, six hundred sixty-eight million, sixty-four thousand, nine hundred twenty".