251243145055 has 8 divisors (see below), whose sum is σ = 344562027552. Its totient is φ = 172281013728.

The previous prime is 251243145019. The next prime is 251243145059. The reversal of 251243145055 is 550541342152.

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 251243145055 - 2³¹ = 249095661407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251243145059) 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 7 ways as a sum of consecutive naturals, for example, 3589187752 + ... + 3589187821.

It is an arithmetic number, because the mean of its divisors is an integer number (43070253444).

Almost surely, 2^251243145055 is an apocalyptic number.

251243145055 is a deficient number, since it is larger than the sum of its proper divisors (93318882497).

251243145055 is an equidigital number, since it uses as much as digits as its factorization.

251243145055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7178375585.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 251243145055 in words is "two hundred fifty-one billion, two hundred forty-three million, one hundred forty-five thousand, fifty-five".