18198015625 has 42 divisors (see below), whose sum is σ = 23200132722. Its totient is φ = 14274000000.

The previous prime is 18198015623. The next prime is 18198015631. The reversal of 18198015625 is 52651089181.

It is a happy number.

It can be written as a sum of positive squares in 21 ways, for example, as 749719161 + 17448296464 = 27381^2 + 132092^2 .

It is not a de Polignac number, because 18198015625 - 2¹ = 18198015623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198015623) 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 41 ways as a sum of consecutive naturals, for example, 58140469 + ... + 58140781.

Almost surely, 2^18198015625 is an apocalyptic number.

It is an amenable number.

18198015625 is a deficient number, since it is larger than the sum of its proper divisors (5002117097).

18198015625 is an frugal number, since it uses more digits than its factorization.

18198015625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 46.

It can be divided in two parts, 1819801 and 5625, that multiplied together give a square (10236380625 = 101175²).

The spelling of 18198015625 in words is "eighteen billion, one hundred ninety-eight million, fifteen thousand, six hundred twenty-five".