165868642 has 8 divisors (see below), whose sum is σ = 251368236. Its totient is φ = 82079232.

The previous prime is 165868627. The next prime is 165868691. The reversal of 165868642 is 246868561.

165868642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 12879²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 165868641 + 1 = 12879^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 165868592 and 165868601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427303 + ... + 427690.

Almost surely, 2^165868642 is an apocalyptic number.

165868642 is a deficient number, since it is larger than the sum of its proper divisors (85499594).

165868642 is an equidigital number, since it uses as much as digits as its factorization.

165868642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855092.

The product of its digits is 552960, while the sum is 46.

The square root of 165868642 is about 12879.0000388229. Note that the first 4 decimals coincide. The cubic root of 165868642 is about 549.4414627370.

The spelling of 165868642 in words is "one hundred sixty-five million, eight hundred sixty-eight thousand, six hundred forty-two".