2118181725 has 192 divisors, whose sum is σ = 4567207680. Its totient is φ = 951091200.

The previous prime is 2118181717. The next prime is 2118181727. The reversal of 2118181725 is 5271818112.

It is not a de Polignac number, because 2118181725 - 2³ = 2118181717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118181725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118181727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 12243739 + ... + 12243911.

It is an arithmetic number, because the mean of its divisors is an integer number (23787540).

Almost surely, 2^2118181725 is an apocalyptic number.

2118181725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2118181725 is an abundant number, since it is smaller than the sum of its proper divisors (2449025955).

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

2118181725 is a wasteful number, since it uses less digits than its factorization.

2118181725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 306 counting only the distinct ones).

The product of its digits is 8960, while the sum is 36.

The square root of 2118181725 is about 46023.7082925746. The cubic root of 2118181725 is about 1284.2642863702.

Adding to 2118181725 its reverse (5271818112), we get a palindrome (7389999837).

The spelling of 2118181725 in words is "two billion, one hundred eighteen million, one hundred eighty-one thousand, seven hundred twenty-five".