18234451225 has 27 divisors (see below), whose sum is σ = 22908434653. Its totient is φ = 14397971840.

The previous prime is 18234451199. The next prime is 18234451231. The reversal of 18234451225 is 52215443281.

The square root of 18234451225 is 135035.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9276964489 + 8957486736 = 96317^2 + 94644^2 .

It is not a de Polignac number, because 18234451225 - 2¹⁹ = 18233926937 is a prime.

It is a super-2 number, since 2×18234451225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 76294656 + ... + 76294894.

Almost surely, 2^18234451225 is an apocalyptic number.

18234451225 is the 135035-th square number.

18234451225 is the 67518-th centered octagonal number.

It is an amenable number.

18234451225 is a deficient number, since it is larger than the sum of its proper divisors (4673983428).

18234451225 is an frugal number, since it uses more digits than its factorization.

18234451225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714 (or 357 counting only the distinct ones).

The product of its digits is 76800, while the sum is 37.

The spelling of 18234451225 in words is "eighteen billion, two hundred thirty-four million, four hundred fifty-one thousand, two hundred twenty-five".