16161618 has 16 divisors (see below), whose sum is σ = 35261856. Its totient is φ = 4897440.

The previous prime is 16161589. The next prime is 16161623. The reversal of 16161618 is 81616161.

It is a happy number.

It is a super-2 number, since 2×16161618² = 522395792755848, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122371 + ... + 122502.

It is an arithmetic number, because the mean of its divisors is an integer number (2203866).

Almost surely, 2^16161618 is an apocalyptic number.

16161618 is an abundant number, since it is smaller than the sum of its proper divisors (19100238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16161618 is a wasteful number, since it uses less digits than its factorization.

16161618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244889.

The product of its digits is 1728, while the sum is 30.

The square root of 16161618 is about 4020.1514896829. The cubic root of 16161618 is about 252.8298105001.

Adding to 16161618 its reverse (81616161), we get a palindrome (97777779).

The spelling of 16161618 in words is "sixteen million, one hundred sixty-one thousand, six hundred eighteen".