251319985378459 has 2 divisors, whose sum is σ = 251319985378460. Its totient is φ = 251319985378458.

The previous prime is 251319985378457. The next prime is 251319985378589. The reversal of 251319985378459 is 954873589913152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251319985378459 - 2¹ = 251319985378457 is a prime.

It is a super-2 number, since 2×251319985378459² (a number of 30 digits) contains 22 as substring.

Together with 251319985378457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (251319985378457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125659992689229 + 125659992689230.

It is an arithmetic number, because the mean of its divisors is an integer number (125659992689230).

Almost surely, 2^{251319985378459} is an apocalyptic number.

251319985378459 is a deficient number, since it is larger than the sum of its proper divisors (1).

251319985378459 is an equidigital number, since it uses as much as digits as its factorization.

251319985378459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328000, while the sum is 79.

The spelling of 251319985378459 in words is "two hundred fifty-one trillion, three hundred nineteen billion, nine hundred eighty-five million, three hundred seventy-eight thousand, four hundred fifty-nine".