256623245212667 has 2 divisors, whose sum is σ = 256623245212668. Its totient is φ = 256623245212666.

The previous prime is 256623245212639. The next prime is 256623245212669. The reversal of 256623245212667 is 766212542326652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256623245212667 - 2¹² = 256623245208571 is a prime.

Together with 256623245212669, 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 (256623245212669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128311622606333 + 128311622606334.

It is an arithmetic number, because the mean of its divisors is an integer number (128311622606334).

Almost surely, 2^{256623245212667} is an apocalyptic number.

256623245212667 is a deficient number, since it is larger than the sum of its proper divisors (1).

256623245212667 is an equidigital number, since it uses as much as digits as its factorization.

256623245212667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 59.

The spelling of 256623245212667 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, two hundred forty-five million, two hundred twelve thousand, six hundred sixty-seven".