1668471408 has 60 divisors (see below), whose sum is σ = 4680716040. Its totient is φ = 554809728.

The previous prime is 1668471403. The next prime is 1668471439. The reversal of 1668471408 is 8041748661.

1668471408 is a `hidden beast` number, since 166 + 84 + 7 + 1 + 408 = 666.

1668471408 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668471401) 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, 46510 + ... + 74162.

It is an arithmetic number, because the mean of its divisors is an integer number (78011934).

Almost surely, 2^1668471408 is an apocalyptic number.

1668471408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1668471408 is an abundant number, since it is smaller than the sum of its proper divisors (3012244632).

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

1668471408 is a wasteful number, since it uses less digits than its factorization.

1668471408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28086 (or 28077 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1668471408 is about 40846.9265428869. The cubic root of 1668471408 is about 1186.0588986122.

The spelling of 1668471408 in words is "one billion, six hundred sixty-eight million, four hundred seventy-one thousand, four hundred eight".