38661109666 has 32 divisors (see below), whose sum is σ = 59564248128. Its totient is φ = 18813922560.

The previous prime is 38661109649. The next prime is 38661109679. The reversal of 38661109666 is 66690116683.

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, 15837006 + ... + 15839446.

It is an arithmetic number, because the mean of its divisors is an integer number (1861382754).

Almost surely, 2^38661109666 is an apocalyptic number.

38661109666 is a deficient number, since it is larger than the sum of its proper divisors (20903138462).

38661109666 is a wasteful number, since it uses less digits than its factorization.

38661109666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 38661109666 in words is "thirty-eight billion, six hundred sixty-one million, one hundred nine thousand, six hundred sixty-six".