163644260146 has 4 divisors (see below), whose sum is σ = 245466390222. Its totient is φ = 81822130072.

The previous prime is 163644260141. The next prime is 163644260161. The reversal of 163644260146 is 641062446361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641062446361 = 2711 ⋅236467151.

It can be written as a sum of positive squares in only one way, i.e., 162929286025 + 714974121 = 403645^2 + 26739^2 .

It is not an unprimeable number, because it can be changed into a prime (163644260141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40911065035 + ... + 40911065038.

Almost surely, 2^163644260146 is an apocalyptic number.

163644260146 is a deficient number, since it is larger than the sum of its proper divisors (81822130076).

163644260146 is an equidigital number, since it uses as much as digits as its factorization.

163644260146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81822130075.

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 163644260146 in words is "one hundred sixty-three billion, six hundred forty-four million, two hundred sixty thousand, one hundred forty-six".