1668520368 has 60 divisors (see below), whose sum is σ = 4684584840. Its totient is φ = 554381568.

The previous prime is 1668520367. The next prime is 1668520391. The reversal of 1668520368 is 8630258661.

1668520368 is a `hidden beast` number, since 1 + 6 + 68 + 520 + 3 + 68 = 666.

1668520368 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1668520367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26563 + ... + 63581.

It is an arithmetic number, because the mean of its divisors is an integer number (78076414).

Almost surely, 2^1668520368 is an apocalyptic number.

1668520368 is a gapful number since it is divisible by the number (18) 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 1668520368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2342292420).

1668520368 is an abundant number, since it is smaller than the sum of its proper divisors (3016064472).

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

1668520368 is a wasteful number, since it uses less digits than its factorization.

1668520368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37346 (or 37337 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1668520368 is about 40847.5258491870. The cubic root of 1668520368 is about 1186.0704998250.

The spelling of 1668520368 in words is "one billion, six hundred sixty-eight million, five hundred twenty thousand, three hundred sixty-eight".