163865320 has 16 divisors (see below), whose sum is σ = 368697060. Its totient is φ = 65546112.

The previous prime is 163865309. The next prime is 163865327. The reversal of 163865320 is 23568361.

It can be written as a sum of positive squares in 2 ways, for example, as 150160516 + 13704804 = 12254^2 + 3702^2 .

It is not an unprimeable number, because it can be changed into a prime (163865327) 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, 2048277 + ... + 2048356.

Almost surely, 2^163865320 is an apocalyptic number.

163865320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163865320 is an abundant number, since it is smaller than the sum of its proper divisors (204831740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163865320 is a wasteful number, since it uses less digits than its factorization.

163865320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096644 (or 4096640 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 163865320 is about 12800.9890242903. The cubic root of 163865320 is about 547.2204893694.

The spelling of 163865320 in words is "one hundred sixty-three million, eight hundred sixty-five thousand, three hundred twenty".