16825944578 has 4 divisors (see below), whose sum is σ = 25238916870. Its totient is φ = 8412972288.

The previous prime is 16825944557. The next prime is 16825944581. The reversal of 16825944578 is 87544952861.

16825944578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87544952861 = 1723 ⋅50809607.

It can be written as a sum of positive squares in only one way, i.e., 11543998249 + 5281946329 = 107443^2 + 72677^2 .

It is a super-2 number, since 2×16825944578² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4206486143 + ... + 4206486146.

Almost surely, 2^16825944578 is an apocalyptic number.

16825944578 is a deficient number, since it is larger than the sum of its proper divisors (8412972292).

16825944578 is an equidigital number, since it uses as much as digits as its factorization.

16825944578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412972291.

The product of its digits is 19353600, while the sum is 59.

The spelling of 16825944578 in words is "sixteen billion, eight hundred twenty-five million, nine hundred forty-four thousand, five hundred seventy-eight".