16851925249 has 2 divisors, whose sum is σ = 16851925250. Its totient is φ = 16851925248.

The previous prime is 16851925229. The next prime is 16851925273. The reversal of 16851925249 is 94252915861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9993601024 + 6858324225 = 99968^2 + 82815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16851925249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16851925196 and 16851925205.

It is not a weakly prime, because it can be changed into another prime (16851925229) 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 as a sum of consecutive naturals, namely, 8425962624 + 8425962625.

It is an arithmetic number, because the mean of its divisors is an integer number (8425962625).

Almost surely, 2^16851925249 is an apocalyptic number.

It is an amenable number.

16851925249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851925249 is an equidigital number, since it uses as much as digits as its factorization.

16851925249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 52.

The spelling of 16851925249 in words is "sixteen billion, eight hundred fifty-one million, nine hundred twenty-five thousand, two hundred forty-nine".