163956689 has 8 divisors (see below), whose sum is σ = 176811432. Its totient is φ = 151136640.

The previous prime is 163956659. The next prime is 163956701. The reversal of 163956689 is 986659361.

It can be written as a sum of positive squares in 4 ways, for example, as 960400 + 162996289 = 980^2 + 12767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163956689 - 2⁸ = 163956433 is a prime.

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 163956689.

It is not an unprimeable number, because it can be changed into a prime (163956649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1607 + ... + 18179.

It is an arithmetic number, because the mean of its divisors is an integer number (22101429).

Almost surely, 2^163956689 is an apocalyptic number.

It is an amenable number.

163956689 is a deficient number, since it is larger than the sum of its proper divisors (12854743).

163956689 is a wasteful number, since it uses less digits than its factorization.

163956689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17347.

The product of its digits is 2099520, while the sum is 53.

The square root of 163956689 is about 12804.5573527553. The cubic root of 163956689 is about 547.3221779570.

The spelling of 163956689 in words is "one hundred sixty-three million, nine hundred fifty-six thousand, six hundred eighty-nine".