1668779712 has 112 divisors (see below), whose sum is σ = 5075224800. Its totient is φ = 537062400.

The previous prime is 1668779699. The next prime is 1668779753. The reversal of 1668779712 is 2179778661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33462 + ... + 66762.

Almost surely, 2^1668779712 is an apocalyptic number.

1668779712 is a gapful number since it is divisible by the number (12) 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 1668779712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537612400).

1668779712 is an abundant number, since it is smaller than the sum of its proper divisors (3406445088).

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

1668779712 is a wasteful number, since it uses less digits than its factorization.

1668779712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33351 (or 33335 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 1668779712 is about 40850.7002632758. The cubic root of 1668779712 is about 1186.1319483471.

The spelling of 1668779712 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-nine thousand, seven hundred twelve".