16161617 has 4 divisors (see below), whose sum is σ = 16864320. Its totient is φ = 15458916.

The previous prime is 16161589. The next prime is 16161623. The reversal of 16161617 is 71616161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71616161 = 109 ⋅657029.

It is a cyclic number.

It is not a de Polignac number, because 16161617 - 2⁶ = 16161553 is a prime.

It is a super-2 number, since 2×16161617² = 522395728109378, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16161617.

It is not an unprimeable number, because it can be changed into a prime (16166617) 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, 351317 + ... + 351362.

It is an arithmetic number, because the mean of its divisors is an integer number (4216080).

Almost surely, 2^16161617 is an apocalyptic number.

It is an amenable number.

16161617 is a deficient number, since it is larger than the sum of its proper divisors (702703).

16161617 is an equidigital number, since it uses as much as digits as its factorization.

16161617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702702.

The product of its digits is 1512, while the sum is 29.

The square root of 16161617 is about 4020.1513653095. The cubic root of 16161617 is about 252.8298052855.

Adding to 16161617 its reverse (71616161), we get a palindrome (87777778).

It can be divided in two parts, 161616 and 17, that multiplied together give a palindrome (2747472).

The spelling of 16161617 in words is "sixteen million, one hundred sixty-one thousand, six hundred seventeen".