1218608828525 has 48 divisors (see below), whose sum is σ = 1679183775360. Its totient is φ = 869887334400.

The previous prime is 1218608828519. The next prime is 1218608828543. The reversal of 1218608828525 is 5258288068121.

It is a happy number.

It is not a de Polignac number, because 1218608828525 - 2¹⁶ = 1218608762989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3010361 + ... + 3391089.

It is an arithmetic number, because the mean of its divisors is an integer number (34982995320).

Almost surely, 2^{1218608828525} is an apocalyptic number.

It is an amenable number.

1218608828525 is a deficient number, since it is larger than the sum of its proper divisors (460574946835).

1218608828525 is a wasteful number, since it uses less digits than its factorization.

1218608828525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380966 (or 380961 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 56.

The spelling of 1218608828525 in words is "one trillion, two hundred eighteen billion, six hundred eight million, eight hundred twenty-eight thousand, five hundred twenty-five".