1668263878 has 8 divisors (see below), whose sum is σ = 2634100920. Its totient is φ = 790230240.

The previous prime is 1668263867. The next prime is 1668263917. The reversal of 1668263878 is 8783628661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21950803 + ... + 21950878.

It is an arithmetic number, because the mean of its divisors is an integer number (329262615).

Almost surely, 2^1668263878 is an apocalyptic number.

1668263878 is a deficient number, since it is larger than the sum of its proper divisors (965837042).

1668263878 is a wasteful number, since it uses less digits than its factorization.

1668263878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43901702.

The product of its digits is 4644864, while the sum is 55.

The square root of 1668263878 is about 40844.3861258803. The cubic root of 1668263878 is about 1186.0097212618.

The spelling of 1668263878 in words is "one billion, six hundred sixty-eight million, two hundred sixty-three thousand, eight hundred seventy-eight".