13778020666 has 8 divisors (see below), whose sum is σ = 21017319840. Its totient is φ = 6772247388.

The previous prime is 13778020643. The next prime is 13778020681. The reversal of 13778020666 is 66602087731.

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

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, 58381326 + ... + 58381561.

It is an arithmetic number, because the mean of its divisors is an integer number (2627164980).

Almost surely, 2^13778020666 is an apocalyptic number.

13778020666 is a deficient number, since it is larger than the sum of its proper divisors (7239299174).

13778020666 is a wasteful number, since it uses less digits than its factorization.

13778020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116762948.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 13778020666 in words is "thirteen billion, seven hundred seventy-eight million, twenty thousand, six hundred sixty-six".