163556666 has 16 divisors (see below), whose sum is σ = 301951104. Its totient is φ = 64703664.

The previous prime is 163556621. The next prime is 163556671. The reversal of 163556666 is 666655361.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449150 + ... + 449513.

It is an arithmetic number, because the mean of its divisors is an integer number (18871944).

Almost surely, 2^163556666 is an apocalyptic number.

163556666 is a deficient number, since it is larger than the sum of its proper divisors (138394438).

163556666 is a wasteful number, since it uses less digits than its factorization.

163556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898685.

The product of its digits is 583200, while the sum is 44.

The square root of 163556666 is about 12788.9274765322. The cubic root of 163556666 is about 546.8766949433.

The spelling of 163556666 in words is "one hundred sixty-three million, five hundred fifty-six thousand, six hundred sixty-six".