16365618225 has 72 divisors (see below), whose sum is σ = 33858538272. Its totient is φ = 7468070400.

The previous prime is 16365618211. The next prime is 16365618229. The reversal of 16365618225 is 52281656361.

16365618225 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 5 + 618 + 2 + 25 = 666.

It is not a de Polignac number, because 16365618225 - 2⁵ = 16365618193 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (16365618229) 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 71 ways as a sum of consecutive naturals, for example, 152407 + ... + 236556.

It is an arithmetic number, because the mean of its divisors is an integer number (470257476).

Almost surely, 2^16365618225 is an apocalyptic number.

16365618225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16365618225 is an abundant number, since it is smaller than the sum of its proper divisors (17492920047).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16365618225 is a wasteful number, since it uses less digits than its factorization.

16365618225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389007 (or 388999 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 16365618225 in words is "sixteen billion, three hundred sixty-five million, six hundred eighteen thousand, two hundred twenty-five".