163552352561 has 16 divisors (see below), whose sum is σ = 181378830864. Its totient is φ = 146497123584.

The previous prime is 163552352549. The next prime is 163552352617. The reversal of 163552352561 is 165253255361.

It can be written as a sum of positive squares in 8 ways, for example, as 1735222336 + 161817130225 = 41656^2 + 402265^2 .

It is a cyclic number.

It is not a de Polignac number, because 163552352561 - 2³⁰ = 162478610737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163552352521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276386 + ... + 635211.

It is an arithmetic number, because the mean of its divisors is an integer number (11336176929).

Almost surely, 2^163552352561 is an apocalyptic number.

It is an amenable number.

163552352561 is a deficient number, since it is larger than the sum of its proper divisors (17826478303).

163552352561 is a wasteful number, since it uses less digits than its factorization.

163552352561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912020.

The product of its digits is 810000, while the sum is 44.

The spelling of 163552352561 in words is "one hundred sixty-three billion, five hundred fifty-two million, three hundred fifty-two thousand, five hundred sixty-one".