1616081688 has 96 divisors (see below), whose sum is σ = 4731002640. Its totient is φ = 495417600.

The previous prime is 1616081627. The next prime is 1616081713. The reversal of 1616081688 is 8861806161.

It is a super-2 number, since 2×1616081688² = 5223440044577858688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261838 + ... + 267938.

Almost surely, 2^1616081688 is an apocalyptic number.

1616081688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1616081688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2365501320).

1616081688 is an abundant number, since it is smaller than the sum of its proper divisors (3114920952).

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

1616081688 is a wasteful number, since it uses less digits than its factorization.

1616081688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409 (or 6402 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 1616081688 is about 40200.5185041188. The cubic root of 1616081688 is about 1173.5126345164.

The spelling of 1616081688 in words is "one billion, six hundred sixteen million, eighty-one thousand, six hundred eighty-eight".