163665285873 has 4 divisors (see below), whose sum is σ = 218220381168. Its totient is φ = 109110190580.

The previous prime is 163665285871. The next prime is 163665285907. The reversal of 163665285873 is 378582566361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163665285873 - 2¹ = 163665285871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163665285871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27277547643 + ... + 27277547648.

It is an arithmetic number, because the mean of its divisors is an integer number (54555095292).

Almost surely, 2^163665285873 is an apocalyptic number.

It is an amenable number.

163665285873 is a deficient number, since it is larger than the sum of its proper divisors (54555095295).

163665285873 is an equidigital number, since it uses as much as digits as its factorization.

163665285873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54555095294.

The product of its digits is 43545600, while the sum is 60.

The spelling of 163665285873 in words is "one hundred sixty-three billion, six hundred sixty-five million, two hundred eighty-five thousand, eight hundred seventy-three".