163645133 has 4 divisors (see below), whose sum is σ = 163672608. Its totient is φ = 163617660.

The previous prime is 163645129. The next prime is 163645159. The reversal of 163645133 is 331546361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331546361 = 9293 ⋅35677.

It is a cyclic number.

It is not a de Polignac number, because 163645133 - 2² = 163645129 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 163645133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163645123) 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, 641 + ... + 18102.

It is an arithmetic number, because the mean of its divisors is an integer number (40918152).

Almost surely, 2^163645133 is an apocalyptic number.

It is an amenable number.

163645133 is a deficient number, since it is larger than the sum of its proper divisors (27475).

163645133 is an equidigital number, since it uses as much as digits as its factorization.

163645133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27474.

The product of its digits is 19440, while the sum is 32.

The square root of 163645133 is about 12792.3857430895. The cubic root of 163645133 is about 546.9752781468.

The spelling of 163645133 in words is "one hundred sixty-three million, six hundred forty-five thousand, one hundred thirty-three".