16161718 has 4 divisors (see below), whose sum is σ = 24242580. Its totient is φ = 8080858.

The previous prime is 16161653. The next prime is 16161727. The reversal of 16161718 is 81716161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×16161718² = 522402257423048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16161718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4040428 + ... + 4040431.

It is an arithmetic number, because the mean of its divisors is an integer number (6060645).

Almost surely, 2^16161718 is an apocalyptic number.

16161718 is a deficient number, since it is larger than the sum of its proper divisors (8080862).

16161718 is an equidigital number, since it uses as much as digits as its factorization.

16161718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080861.

The product of its digits is 2016, while the sum is 31.

The square root of 16161718 is about 4020.1639270060. The cubic root of 16161718 is about 252.8303319604.

Adding to 16161718 its reverse (81716161), we get a palindrome (97877879).

The spelling of 16161718 in words is "sixteen million, one hundred sixty-one thousand, seven hundred eighteen".