161005618 has 8 divisors (see below), whose sum is σ = 242760348. Its totient is φ = 80085504.

The previous prime is 161005613. The next prime is 161005619. The reversal of 161005618 is 816500161.

It can be written as a sum of positive squares in 2 ways, for example, as 160604929 + 400689 = 12673^2 + 633^2 .

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

It is a super-3 number, since 3×161005618³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161005613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208171 + ... + 208942.

Almost surely, 2^161005618 is an apocalyptic number.

161005618 is a deficient number, since it is larger than the sum of its proper divisors (81754730).

161005618 is a wasteful number, since it uses less digits than its factorization.

161005618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417308.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 161005618 is about 12688.7989187314. The cubic root of 161005618 is about 544.0185101293.

Adding to 161005618 its reverse (816500161), we get a palindrome (977505779).

The spelling of 161005618 in words is "one hundred sixty-one million, five thousand, six hundred eighteen".