163810642 has 4 divisors (see below), whose sum is σ = 245715966. Its totient is φ = 81905320.

The previous prime is 163810639. The next prime is 163810643. The reversal of 163810642 is 246018361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 116186841 + 47623801 = 10779^2 + 6901^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (163810643) 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 as a sum of consecutive naturals, namely, 40952659 + ... + 40952662.

Almost surely, 2^163810642 is an apocalyptic number.

163810642 is a deficient number, since it is larger than the sum of its proper divisors (81905324).

163810642 is an equidigital number, since it uses as much as digits as its factorization.

163810642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81905323.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 163810642 is about 12798.8531517476. The cubic root of 163810642 is about 547.1596177330.

The spelling of 163810642 in words is "one hundred sixty-three million, eight hundred ten thousand, six hundred forty-two".