2005453240251 has 4 divisors (see below), whose sum is σ = 2673937653672. Its totient is φ = 1336968826832.

The previous prime is 2005453240211. The next prime is 2005453240253. The reversal of 2005453240251 is 1520423545002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2005453240251 - 2²¹ = 2005451143099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005453240253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334242206706 + ... + 334242206711.

It is an arithmetic number, because the mean of its divisors is an integer number (668484413418).

Almost surely, 2^{2005453240251} is an apocalyptic number.

2005453240251 is a deficient number, since it is larger than the sum of its proper divisors (668484413421).

2005453240251 is an equidigital number, since it uses as much as digits as its factorization.

2005453240251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668484413420.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 2005453240251 its reverse (1520423545002), we get a palindrome (3525876785253).

The spelling of 2005453240251 in words is "two trillion, five billion, four hundred fifty-three million, two hundred forty thousand, two hundred fifty-one".