18685796416 has 63 divisors (see below), whose sum is σ = 43151121597. Its totient is φ = 8004917760.

The previous prime is 18685796369. The next prime is 18685796429. The reversal of 18685796416 is 61469758681.

It is a happy number.

The square root of 18685796416 is 136696.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1806590016 + 16879206400 = 42504^2 + 129920^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7653756 + ... + 7656196.

Almost surely, 2^18685796416 is an apocalyptic number.

18685796416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18685796416 is the 136696-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18685796416

18685796416 is an abundant number, since it is smaller than the sum of its proper divisors (24465325181).

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

18685796416 is an frugal number, since it uses more digits than its factorization.

18685796416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908 (or 2450 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 61.

The spelling of 18685796416 in words is "eighteen billion, six hundred eighty-five million, seven hundred ninety-six thousand, four hundred sixteen".