2118818625 has 64 divisors (see below), whose sum is σ = 4395755520. Its totient is φ = 880536000.

The previous prime is 2118818621. The next prime is 2118818629. The reversal of 2118818625 is 5268188112.

It is an interprime number because it is at equal distance from previous prime (2118818621) and next prime (2118818629).

It is not a de Polignac number, because 2118818625 - 2² = 2118818621 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2118818621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7815 + ... + 65564.

It is an arithmetic number, because the mean of its divisors is an integer number (68683680).

Almost surely, 2^2118818625 is an apocalyptic number.

2118818625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2118818625 is an abundant number, since it is smaller than the sum of its proper divisors (2276936895).

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

2118818625 is a wasteful number, since it uses less digits than its factorization.

2118818625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73415 (or 73405 counting only the distinct ones).

The product of its digits is 61440, while the sum is 42.

The square root of 2118818625 is about 46030.6270324444. The cubic root of 2118818625 is about 1284.3929920343.

The spelling of 2118818625 in words is "two billion, one hundred eighteen million, eight hundred eighteen thousand, six hundred twenty-five".