165950618 has 4 divisors (see below), whose sum is σ = 248925930. Its totient is φ = 82975308.

The previous prime is 165950597. The next prime is 165950623. The reversal of 165950618 is 816059561.

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., 115498009 + 50452609 = 10747^2 + 7103^2 .

It is a super-2 number, since 2×165950618² = 55079215229163848, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 41487653 + ... + 41487656.

Almost surely, 2^165950618 is an apocalyptic number.

165950618 is a deficient number, since it is larger than the sum of its proper divisors (82975312).

165950618 is an equidigital number, since it uses as much as digits as its factorization.

165950618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82975311.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 165950618 is about 12882.1821909178. The cubic root of 165950618 is about 549.5319632575.

The spelling of 165950618 in words is "one hundred sixty-five million, nine hundred fifty thousand, six hundred eighteen".