163656541 has 4 divisors (see below), whose sum is σ = 169299900. Its totient is φ = 158013184.

The previous prime is 163656539. The next prime is 163656547. The reversal of 163656541 is 145656361.

163656541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145656361 = 1709 ⋅85229.

It can be written as a sum of positive squares in 2 ways, for example, as 138556441 + 25100100 = 11771^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 163656541 - 2¹ = 163656539 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 163656541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163656547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2821636 + ... + 2821693.

It is an arithmetic number, because the mean of its divisors is an integer number (42324975).

Almost surely, 2^163656541 is an apocalyptic number.

It is an amenable number.

163656541 is a deficient number, since it is larger than the sum of its proper divisors (5643359).

163656541 is an equidigital number, since it uses as much as digits as its factorization.

163656541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643358.

The product of its digits is 64800, while the sum is 37.

The square root of 163656541 is about 12792.8316255628. The cubic root of 163656541 is about 546.9879880655.

The spelling of 163656541 in words is "one hundred sixty-three million, six hundred fifty-six thousand, five hundred forty-one".