253111520345 has 4 divisors (see below), whose sum is σ = 303733824420. Its totient is φ = 202489216272.

The previous prime is 253111520341. The next prime is 253111520393. The reversal of 253111520345 is 543025111352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108855124624 + 144256395721 = 329932^2 + 379811^2 .

It is a cyclic number.

It is not a de Polignac number, because 253111520345 - 2² = 253111520341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253111520341) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 25311152030 + ... + 25311152039.

It is an arithmetic number, because the mean of its divisors is an integer number (75933456105).

Almost surely, 2^253111520345 is an apocalyptic number.

It is an amenable number.

253111520345 is a deficient number, since it is larger than the sum of its proper divisors (50622304075).

253111520345 is an equidigital number, since it uses as much as digits as its factorization.

253111520345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50622304074.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 253111520345 its reverse (543025111352), we get a palindrome (796136631697).

The spelling of 253111520345 in words is "two hundred fifty-three billion, one hundred eleven million, five hundred twenty thousand, three hundred forty-five".