163066521 has 4 divisors (see below), whose sum is σ = 217422032. Its totient is φ = 108711012.

The previous prime is 163066517. The next prime is 163066523. The reversal of 163066521 is 125660361.

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: 125660361 = 3 ⋅41886787.

It is not a de Polignac number, because 163066521 - 2² = 163066517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163066523) 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 3 ways as a sum of consecutive naturals, for example, 27177751 + ... + 27177756.

It is an arithmetic number, because the mean of its divisors is an integer number (54355508).

Almost surely, 2^163066521 is an apocalyptic number.

It is an amenable number.

163066521 is a deficient number, since it is larger than the sum of its proper divisors (54355511).

163066521 is an equidigital number, since it uses as much as digits as its factorization.

163066521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54355510.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 163066521 is about 12769.7502324830. The cubic root of 163066521 is about 546.3298567680.

The spelling of 163066521 in words is "one hundred sixty-three million, sixty-six thousand, five hundred twenty-one".