253645238443 has 8 divisors (see below), whose sum is σ = 257811534720. Its totient is φ = 249479206080.

The previous prime is 253645238423. The next prime is 253645238449. The reversal of 253645238443 is 344832546352.

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 253645238443 - 2⁹ = 253645237931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253645238449) 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, 3139863 + ... + 3219631.

It is an arithmetic number, because the mean of its divisors is an integer number (32226441840).

Almost surely, 2^253645238443 is an apocalyptic number.

253645238443 is a deficient number, since it is larger than the sum of its proper divisors (4166296277).

253645238443 is an equidigital number, since it uses as much as digits as its factorization.

253645238443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131957.

The product of its digits is 8294400, while the sum is 49.

The spelling of 253645238443 in words is "two hundred fifty-three billion, six hundred forty-five million, two hundred thirty-eight thousand, four hundred forty-three".