163665513 has 24 divisors (see below), whose sum is σ = 258492000. Its totient is φ = 98962560.

The previous prime is 163665499. The next prime is 163665517. The reversal of 163665513 is 315566361.

163665513 is a `hidden beast` number, since 1 + 636 + 6 + 5 + 5 + 13 = 666.

It is not a de Polignac number, because 163665513 - 2¹⁰ = 163664489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163665517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47745 + ... + 51057.

It is an arithmetic number, because the mean of its divisors is an integer number (10770500).

Almost surely, 2^163665513 is an apocalyptic number.

It is an amenable number.

163665513 is a deficient number, since it is larger than the sum of its proper divisors (94826487).

163665513 is a wasteful number, since it uses less digits than its factorization.

163665513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3826 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 163665513 is about 12793.1822858896. The cubic root of 163665513 is about 546.9979835648.

The spelling of 163665513 in words is "one hundred sixty-three million, six hundred sixty-five thousand, five hundred thirteen".