18307443025 has 9 divisors (see below), whose sum is σ = 22702068273. Its totient is φ = 14645413200.

The previous prime is 18307443013. The next prime is 18307443029. The reversal of 18307443025 is 52034470381.

It is a happy number.

The square root of 18307443025 is 135305.

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 5380662609 + 12926780416 = 73353^2 + 113696^2 .

It is not a de Polignac number, because 18307443025 - 2¹³ = 18307434833 is a prime.

It is a super-2 number, since 2×18307443025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18307443029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 662995 + ... + 690055.

Almost surely, 2^18307443025 is an apocalyptic number.

18307443025 is the 135305-th square number.

18307443025 is the 67653-rd centered octagonal number.

It is an amenable number.

18307443025 is a deficient number, since it is larger than the sum of its proper divisors (4394625248).

18307443025 is an frugal number, since it uses more digits than its factorization.

18307443025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54132 (or 27066 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 18307443025 in words is "eighteen billion, three hundred seven million, four hundred forty-three thousand, twenty-five".