251243140245 has 8 divisors (see below), whose sum is σ = 401989024416. Its totient is φ = 133996341456.

The previous prime is 251243140243. The next prime is 251243140271. The reversal of 251243140245 is 542041342152.

251243140245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251243140245 - 2¹ = 251243140243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251243140243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8374771327 + ... + 8374771356.

It is an arithmetic number, because the mean of its divisors is an integer number (50248628052).

Almost surely, 2^251243140245 is an apocalyptic number.

It is an amenable number.

251243140245 is a deficient number, since it is larger than the sum of its proper divisors (150745884171).

251243140245 is a wasteful number, since it uses less digits than its factorization.

251243140245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16749542691.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 251243140245 its reverse (542041342152), we get a palindrome (793284482397).

The spelling of 251243140245 in words is "two hundred fifty-one billion, two hundred forty-three million, one hundred forty thousand, two hundred forty-five".