163813665 has 16 divisors (see below), whose sum is σ = 262963008. Its totient is φ = 87080256.

The previous prime is 163813627. The next prime is 163813669. The reversal of 163813665 is 566318361.

It is not a de Polignac number, because 163813665 - 2¹⁴ = 163797281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163813669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13182 + ... + 22391.

It is an arithmetic number, because the mean of its divisors is an integer number (16435188).

Almost surely, 2^163813665 is an apocalyptic number.

163813665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163813665 is a deficient number, since it is larger than the sum of its proper divisors (99149343).

163813665 is a wasteful number, since it uses less digits than its factorization.

163813665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35888.

The product of its digits is 77760, while the sum is 39.

The square root of 163813665 is about 12798.9712477214. The cubic root of 163813665 is about 547.1629835163.

The spelling of 163813665 in words is "one hundred sixty-three million, eight hundred thirteen thousand, six hundred sixty-five".