16123356225 has 36 divisors (see below), whose sum is σ = 28929005196. Its totient is φ = 8584151040.

The previous prime is 16123356211. The next prime is 16123356233. The reversal of 16123356225 is 52265332161.

16123356225 is a `hidden beast` number, since 1 + 6 + 1 + 23 + 3 + 5 + 622 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 4456764081 + 11666592144 = 66759^2 + 108012^2 .

It is not a de Polignac number, because 16123356225 - 2⁴ = 16123356209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16123356225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 67729 + ... + 191921.

Almost surely, 2^16123356225 is an apocalyptic number.

16123356225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16123356225 is a deficient number, since it is larger than the sum of its proper divisors (12805648971).

16123356225 is a wasteful number, since it uses less digits than its factorization.

16123356225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124786 (or 124778 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

Adding to 16123356225 its reverse (52265332161), we get a palindrome (68388688386).

The spelling of 16123356225 in words is "sixteen billion, one hundred twenty-three million, three hundred fifty-six thousand, two hundred twenty-five".