1668383550 has 72 divisors (see below), whose sum is σ = 4555947240. Its totient is φ = 437601600.

The previous prime is 1668383491. The next prime is 1668383569. The reversal of 1668383550 is 553838661.

1668383550 is a `hidden beast` number, since 1 + 6 + 68 + 38 + 3 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1668383496 and 1668383505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2940 + ... + 57839.

It is an arithmetic number, because the mean of its divisors is an integer number (63277045).

Almost surely, 2^1668383550 is an apocalyptic number.

1668383550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668383550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2277973620).

1668383550 is an abundant number, since it is smaller than the sum of its proper divisors (2887563690).

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

1668383550 is a wasteful number, since it uses less digits than its factorization.

1668383550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60858 (or 60850 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1668383550 is about 40845.8510744972. The cubic root of 1668383550 is about 1186.0380798373.

The spelling of 1668383550 in words is "one billion, six hundred sixty-eight million, three hundred eighty-three thousand, five hundred fifty".