16398894225 has 24 divisors (see below), whose sum is σ = 30986102080. Its totient is φ = 7496637120.

The previous prime is 16398894217. The next prime is 16398894227. The reversal of 16398894225 is 52249889361.

It is not a de Polignac number, because 16398894225 - 2³ = 16398894217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16398894227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15617470 + ... + 15618519.

Almost surely, 2^16398894225 is an apocalyptic number.

16398894225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16398894225 is a deficient number, since it is larger than the sum of its proper divisors (14587207855).

16398894225 is a wasteful number, since it uses less digits than its factorization.

16398894225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31236009 (or 31236004 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 57.

The spelling of 16398894225 in words is "sixteen billion, three hundred ninety-eight million, eight hundred ninety-four thousand, two hundred twenty-five".