163985274287 has 4 divisors (see below), whose sum is σ = 167079336120. Its totient is φ = 160891212456.

The previous prime is 163985274263. The next prime is 163985274293. The reversal of 163985274287 is 782472589361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163985274287 - 2¹² = 163985270191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163985274587) 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, 1547030837 + ... + 1547030942.

It is an arithmetic number, because the mean of its divisors is an integer number (41769834030).

Almost surely, 2^163985274287 is an apocalyptic number.

163985274287 is a deficient number, since it is larger than the sum of its proper divisors (3094061833).

163985274287 is an equidigital number, since it uses as much as digits as its factorization.

163985274287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094061832.

The product of its digits is 40642560, while the sum is 62.

The spelling of 163985274287 in words is "one hundred sixty-three billion, nine hundred eighty-five million, two hundred seventy-four thousand, two hundred eighty-seven".