253684981845 has 24 divisors (see below), whose sum is σ = 447173532000. Its totient is φ = 133005458016.

The previous prime is 253684981829. The next prime is 253684981853. The reversal of 253684981845 is 548189486352.

253684981845 is a `hidden beast` number, since 2 + 5 + 3 + 68 + 498 + 1 + 84 + 5 = 666.

It is not a de Polignac number, because 253684981845 - 2⁴ = 253684981829 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 47772295 + ... + 47777604.

It is an arithmetic number, because the mean of its divisors is an integer number (18632230500).

Almost surely, 2^253684981845 is an apocalyptic number.

It is an amenable number.

253684981845 is a deficient number, since it is larger than the sum of its proper divisors (193488550155).

253684981845 is a wasteful number, since it uses less digits than its factorization.

253684981845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95549969 (or 95549966 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 63.

The spelling of 253684981845 in words is "two hundred fifty-three billion, six hundred eighty-four million, nine hundred eighty-one thousand, eight hundred forty-five".