163532681 has 12 divisors (see below), whose sum is σ = 177882588. Its totient is φ = 150269184.

The previous prime is 163532669. The next prime is 163532683. The reversal of 163532681 is 186235361.

It can be written as a sum of positive squares in 6 ways, for example, as 98327056 + 65205625 = 9916^2 + 8075^2 .

It is a de Polignac number, because none of the positive numbers 2^k-163532681 is a prime.

It is a super-2 number, since 2×163532681² = 53485875510095522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163532683) 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 11 ways as a sum of consecutive naturals, for example, 37301 + ... + 41453.

It is an arithmetic number, because the mean of its divisors is an integer number (14823549).

Almost surely, 2^163532681 is an apocalyptic number.

It is an amenable number.

163532681 is a deficient number, since it is larger than the sum of its proper divisors (14349907).

163532681 is a wasteful number, since it uses less digits than its factorization.

163532681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4412 (or 4399 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 163532681 is about 12787.9897169180. The cubic root of 163532681 is about 546.8499611328.

It can be divided in two parts, 1635 and 32681, that multiplied together give a palindrome (53433435).

The spelling of 163532681 in words is "one hundred sixty-three million, five hundred thirty-two thousand, six hundred eighty-one".