16394785617 has 8 divisors (see below), whose sum is σ = 24982530496. Its totient is φ = 9368448912.

The previous prime is 16394785613. The next prime is 16394785619. The reversal of 16394785617 is 71658749361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16394785617 - 2² = 16394785613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16394785613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390352018 + ... + 390352059.

It is an arithmetic number, because the mean of its divisors is an integer number (3122816312).

Almost surely, 2^16394785617 is an apocalyptic number.

It is an amenable number.

16394785617 is a deficient number, since it is larger than the sum of its proper divisors (8587744879).

16394785617 is an equidigital number, since it uses as much as digits as its factorization.

16394785617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780704087.

The product of its digits is 7620480, while the sum is 57.

It can be divided in two parts, 16394 and 785617, that added together give a triangular number (802011 = T₁₂₆₆).

The spelling of 16394785617 in words is "sixteen billion, three hundred ninety-four million, seven hundred eighty-five thousand, six hundred seventeen".