163644446361 has 24 divisors (see below), whose sum is σ = 240046835392. Its totient is φ = 99089416800.

The previous prime is 163644446323. The next prime is 163644446389.

163644446361 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-163644446361 is a prime.

It is a super-2 number, since 2×163644446361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163644446361.

It is not an unprimeable number, because it can be changed into a prime (163644446561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203676 + ... + 607266.

Almost surely, 2^163644446361 is an apocalyptic number.

163644446361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

163644446361 is a deficient number, since it is larger than the sum of its proper divisors (76402389031).

163644446361 is a wasteful number, since it uses less digits than its factorization.

163644446361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404733 (or 404722 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 48.

The spelling of 163644446361 in words is "one hundred sixty-three billion, six hundred forty-four million, four hundred forty-six thousand, three hundred sixty-one".