857426207356391 has 2 divisors, whose sum is σ = 857426207356392. Its totient is φ = 857426207356390.

The previous prime is 857426207356387. The next prime is 857426207356409. The reversal of 857426207356391 is 193653702624758.

857426207356391 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 not a de Polignac number, because 857426207356391 - 2² = 857426207356387 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857426207256391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428713103678195 + 428713103678196.

It is an arithmetic number, because the mean of its divisors is an integer number (428713103678196).

It is a 1-persistent number, because it is pandigital, but 2⋅857426207356391 = 1714852414712782 is not.

Almost surely, 2^{857426207356391} is an apocalyptic number.

857426207356391 is a deficient number, since it is larger than the sum of its proper divisors (1).

857426207356391 is an equidigital number, since it uses as much as digits as its factorization.

857426207356391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 457228800, while the sum is 68.

The spelling of 857426207356391 in words is "eight hundred fifty-seven trillion, four hundred twenty-six billion, two hundred seven million, three hundred fifty-six thousand, three hundred ninety-one".