16512251225 has 6 divisors (see below), whose sum is σ = 20475191550. Its totient is φ = 13209800960.

The previous prime is 16512251201. The next prime is 16512251227. The reversal of 16512251225 is 52215221561.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5940093184 + 10572158041 = 77072^2 + 102821^2 .

It is not a de Polignac number, because 16512251225 - 2²⁰ = 16511202649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16512251191 and 16512251200.

It is not an unprimeable number, because it can be changed into a prime (16512251227) 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, 330245000 + ... + 330245049.

It is an arithmetic number, because the mean of its divisors is an integer number (3412531925).

Almost surely, 2^16512251225 is an apocalyptic number.

It is an amenable number.

16512251225 is a deficient number, since it is larger than the sum of its proper divisors (3962940325).

16512251225 is an equidigital number, since it uses as much as digits as its factorization.

16512251225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660490059 (or 660490054 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

Adding to 16512251225 its reverse (52215221561), we get a palindrome (68727472786).

It can be divided in two parts, 1651225 and 1225, that multiplied together give a square (2022750625 = 44975²).

The spelling of 16512251225 in words is "sixteen billion, five hundred twelve million, two hundred fifty-one thousand, two hundred twenty-five".