165618938 has 4 divisors (see below), whose sum is σ = 248428410. Its totient is φ = 82809468.

The previous prime is 165618899. The next prime is 165618941. The reversal of 165618938 is 839816561.

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., 148669249 + 16949689 = 12193^2 + 4117^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165618892 and 165618901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41404733 + ... + 41404736.

Almost surely, 2^165618938 is an apocalyptic number.

165618938 is a deficient number, since it is larger than the sum of its proper divisors (82809472).

165618938 is an equidigital number, since it uses as much as digits as its factorization.

165618938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82809471.

The product of its digits is 311040, while the sum is 47.

The square root of 165618938 is about 12869.3021566828. The cubic root of 165618938 is about 549.1656086349.

The spelling of 165618938 in words is "one hundred sixty-five million, six hundred eighteen thousand, nine hundred thirty-eight".