12161616 has 20 divisors (see below), whose sum is σ = 31417632. Its totient is φ = 4053856.

The previous prime is 12161599. The next prime is 12161623. The reversal of 12161616 is 61616121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

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

12161616 is a modest number, since divided by 1616 gives 1216 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126636 + ... + 126731.

Almost surely, 2^12161616 is an apocalyptic number.

12161616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12161616 is an abundant number, since it is smaller than the sum of its proper divisors (19256016).

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

12161616 is a wasteful number, since it uses less digits than its factorization.

12161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253378 (or 253372 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 12161616 is about 3487.3508570260. The cubic root of 12161616 is about 229.9660693488.

Adding to 12161616 its reverse (61616121), we get a palindrome (73777737).

The spelling of 12161616 in words is "twelve million, one hundred sixty-one thousand, six hundred sixteen".