163557943 has 8 divisors (see below), whose sum is σ = 166180896. Its totient is φ = 160944000.

The previous prime is 163557931. The next prime is 163557959. The reversal of 163557943 is 349755361.

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 163557943 - 2⁹ = 163557431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163557943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163557913) 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, 40755 + ... + 44587.

It is an arithmetic number, because the mean of its divisors is an integer number (20772612).

Almost surely, 2^163557943 is an apocalyptic number.

163557943 is a deficient number, since it is larger than the sum of its proper divisors (2622953).

163557943 is an equidigital number, since it uses as much as digits as its factorization.

163557943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505.

The product of its digits is 340200, while the sum is 43.

The square root of 163557943 is about 12788.9774024353. The cubic root of 163557943 is about 546.8781182211.

The spelling of 163557943 in words is "one hundred sixty-three million, five hundred fifty-seven thousand, nine hundred forty-three".