163242178561 has 16 divisors (see below), whose sum is σ = 203694289920. Its totient is φ = 127094464080.

The previous prime is 163242178553. The next prime is 163242178577. The reversal of 163242178561 is 165871242361.

It is a cyclic number.

It is not a de Polignac number, because 163242178561 - 2³ = 163242178553 is a prime.

It is a super-2 number, since 2×163242178561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163242178501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801621 + ... + 984418.

It is an arithmetic number, because the mean of its divisors is an integer number (12730893120).

Almost surely, 2^163242178561 is an apocalyptic number.

163242178561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163242178561 is a deficient number, since it is larger than the sum of its proper divisors (40452111359).

163242178561 is a wasteful number, since it uses less digits than its factorization.

163242178561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787244.

The product of its digits is 483840, while the sum is 46.

The spelling of 163242178561 in words is "one hundred sixty-three billion, two hundred forty-two million, one hundred seventy-eight thousand, five hundred sixty-one".