251319402667 has 2 divisors, whose sum is σ = 251319402668. Its totient is φ = 251319402666.

The previous prime is 251319402643. The next prime is 251319402731. The reversal of 251319402667 is 766204913152.

It is a happy number.

251319402667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251319402667 is a prime.

It is a super-2 number, since 2×251319402667² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251319402967) 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 as a sum of consecutive naturals, namely, 125659701333 + 125659701334.

It is an arithmetic number, because the mean of its divisors is an integer number (125659701334).

Almost surely, 2^251319402667 is an apocalyptic number.

251319402667 is a deficient number, since it is larger than the sum of its proper divisors (1).

251319402667 is an equidigital number, since it uses as much as digits as its factorization.

251319402667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 251319402667 in words is "two hundred fifty-one billion, three hundred nineteen million, four hundred two thousand, six hundred sixty-seven".