163860566 has 4 divisors (see below), whose sum is σ = 245790852. Its totient is φ = 81930282.

The previous prime is 163860553. The next prime is 163860589. The reversal of 163860566 is 665068361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665068361 = 863 ⋅770647.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40965140 + ... + 40965143.

It is an arithmetic number, because the mean of its divisors is an integer number (61447713).

Almost surely, 2^163860566 is an apocalyptic number.

163860566 is a deficient number, since it is larger than the sum of its proper divisors (81930286).

163860566 is an equidigital number, since it uses as much as digits as its factorization.

163860566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81930285.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 163860566 is about 12800.8033341662. The cubic root of 163860566 is about 547.2151973988.

The spelling of 163860566 in words is "one hundred sixty-three million, eight hundred sixty thousand, five hundred sixty-six".