16683618425 has 6 divisors (see below), whose sum is σ = 20687686878. Its totient is φ = 13346894720.

The previous prime is 16683618421. The next prime is 16683618449. The reversal of 16683618425 is 52481638661.

It can be written as a sum of positive squares in 3 ways, for example, as 1688881216 + 14994737209 = 41096^2 + 122453^2 .

It is not a de Polignac number, because 16683618425 - 2² = 16683618421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16683618421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333672344 + ... + 333672393.

It is an arithmetic number, because the mean of its divisors is an integer number (3447947813).

Almost surely, 2^16683618425 is an apocalyptic number.

It is an amenable number.

16683618425 is a deficient number, since it is larger than the sum of its proper divisors (4004068453).

16683618425 is an equidigital number, since it uses as much as digits as its factorization.

16683618425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667344747 (or 667344742 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The spelling of 16683618425 in words is "sixteen billion, six hundred eighty-three million, six hundred eighteen thousand, four hundred twenty-five".