18326390625 has 105 divisors (see below), whose sum is σ = 34927150583. Its totient is φ = 9259650000.

The previous prime is 18326390623. The next prime is 18326390627. The reversal of 18326390625 is 52609362381.

The square root of 18326390625 is 135375.

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

18326390625 is a `hidden beast` number, since 1 + 8 + 3 + 2 + 639 + 0 + 6 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (18326390623) and next prime (18326390627).

It can be written as a sum of positive squares in 3 ways, for example, as 16055677521 + 2270713104 = 126711^2 + 47652^2 .

It is not a de Polignac number, because 18326390625 - 2¹ = 18326390623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18326390623) by changing a digit.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 964546866 + ... + 964546884.

Almost surely, 2^18326390625 is an apocalyptic number.

18326390625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18326390625 is the 135375-th square number.

18326390625 is the 67688-th centered octagonal number.

It is an amenable number.

18326390625 is a deficient number, since it is larger than the sum of its proper divisors (16600759958).

18326390625 is an frugal number, since it uses more digits than its factorization.

18326390625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 18326390625 in words is "eighteen billion, three hundred twenty-six million, three hundred ninety thousand, six hundred twenty-five".