253681865585 has 8 divisors (see below), whose sum is σ = 307211067240. Its totient is φ = 201083606784.

The previous prime is 253681865581. The next prime is 253681865623. The reversal of 253681865585 is 585568186352.

It can be written as a sum of positive squares in 4 ways, for example, as 25013320336 + 228668545249 = 158156^2 + 478193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253681865585 - 2² = 253681865581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253681865581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232735112 + ... + 232736201.

It is an arithmetic number, because the mean of its divisors is an integer number (38401383405).

Almost surely, 2^253681865585 is an apocalyptic number.

It is an amenable number.

253681865585 is a deficient number, since it is larger than the sum of its proper divisors (53529201655).

253681865585 is a wasteful number, since it uses less digits than its factorization.

253681865585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465471427.

The product of its digits is 69120000, while the sum is 62.

The spelling of 253681865585 in words is "two hundred fifty-three billion, six hundred eighty-one million, eight hundred sixty-five thousand, five hundred eighty-five".