253550043545 has 4 divisors (see below), whose sum is σ = 304260052260. Its totient is φ = 202840034832.

The previous prime is 253550043503. The next prime is 253550043557. The reversal of 253550043545 is 545340055352.

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 187126321561 + 66423721984 = 432581^2 + 257728^2 .

It is a cyclic number.

It is not a de Polignac number, because 253550043545 - 2²² = 253545849241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25355004350 + ... + 25355004359.

It is an arithmetic number, because the mean of its divisors is an integer number (76065013065).

Almost surely, 2^253550043545 is an apocalyptic number.

It is an amenable number.

253550043545 is a deficient number, since it is larger than the sum of its proper divisors (50710008715).

253550043545 is an equidigital number, since it uses as much as digits as its factorization.

253550043545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50710008714.

The product of its (nonzero) digits is 900000, while the sum is 41.

Adding to 253550043545 its reverse (545340055352), we get a palindrome (798890098897).

The spelling of 253550043545 in words is "two hundred fifty-three billion, five hundred fifty million, forty-three thousand, five hundred forty-five".