163666577 has 16 divisors (see below), whose sum is σ = 174461952. Its totient is φ = 153264960.

The previous prime is 163666543. The next prime is 163666583. The reversal of 163666577 is 775666361.

It is a cyclic number.

It is not a de Polignac number, because 163666577 - 2¹⁰ = 163665553 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163666277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335828 + ... + 336314.

It is an arithmetic number, because the mean of its divisors is an integer number (10903872).

Almost surely, 2^163666577 is an apocalyptic number.

It is an amenable number.

163666577 is a deficient number, since it is larger than the sum of its proper divisors (10795375).

163666577 is a wasteful number, since it uses less digits than its factorization.

163666577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848.

The product of its digits is 952560, while the sum is 47.

The square root of 163666577 is about 12793.2238704714. The cubic root of 163666577 is about 546.9991689186. Note that the first 3 decimals are identical.

The spelling of 163666577 in words is "one hundred sixty-three million, six hundred sixty-six thousand, five hundred seventy-seven".