163403565 has 48 divisors (see below), whose sum is σ = 287307072. Its totient is φ = 79252992.

The previous prime is 163403561. The next prime is 163403587. The reversal of 163403565 is 565304361.

It is not a de Polignac number, because 163403565 - 2² = 163403561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163403561) 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 47 ways as a sum of consecutive naturals, for example, 184614 + ... + 185496.

It is an arithmetic number, because the mean of its divisors is an integer number (5985564).

Almost surely, 2^163403565 is an apocalyptic number.

163403565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163403565 is a deficient number, since it is larger than the sum of its proper divisors (123903507).

163403565 is a wasteful number, since it uses less digits than its factorization.

163403565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 163403565 is about 12782.9403894409. The cubic root of 163403565 is about 546.7060028126.

The spelling of 163403565 in words is "one hundred sixty-three million, four hundred three thousand, five hundred sixty-five".