251216313221507 has 2 divisors, whose sum is σ = 251216313221508. Its totient is φ = 251216313221506.

The previous prime is 251216313221491. The next prime is 251216313221509. The reversal of 251216313221507 is 705122313612152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251216313221507 - 2⁴ = 251216313221491 is a prime.

Together with 251216313221509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251216313221509) 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 as a sum of consecutive naturals, namely, 125608156610753 + 125608156610754.

It is an arithmetic number, because the mean of its divisors is an integer number (125608156610754).

Almost surely, 2^{251216313221507} is an apocalyptic number.

251216313221507 is a deficient number, since it is larger than the sum of its proper divisors (1).

251216313221507 is an equidigital number, since it uses as much as digits as its factorization.

251216313221507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

Adding to 251216313221507 its reverse (705122313612152), we get a palindrome (956338626833659).

The spelling of 251216313221507 in words is "two hundred fifty-one trillion, two hundred sixteen billion, three hundred thirteen million, two hundred twenty-one thousand, five hundred seven".