251343513455 has 4 divisors (see below), whose sum is σ = 301612216152. Its totient is φ = 201074810760.

The previous prime is 251343513439. The next prime is 251343513523. The reversal of 251343513455 is 554315343152.

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

It is not a de Polignac number, because 251343513455 - 2⁴ = 251343513439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 25134351341 + ... + 25134351350.

It is an arithmetic number, because the mean of its divisors is an integer number (75403054038).

Almost surely, 2^251343513455 is an apocalyptic number.

251343513455 is a deficient number, since it is larger than the sum of its proper divisors (50268702697).

251343513455 is an equidigital number, since it uses as much as digits as its factorization.

251343513455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50268702696.

The product of its digits is 540000, while the sum is 41.

The spelling of 251343513455 in words is "two hundred fifty-one billion, three hundred forty-three million, five hundred thirteen thousand, four hundred fifty-five".