857426207356387 has 2 divisors, whose sum is σ = 857426207356388. Its totient is φ = 857426207356386.

The previous prime is 857426207356253. The next prime is 857426207356391. The reversal of 857426207356387 is 783653702624758.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857426207356387 is a prime.

It is not a weakly prime, because it can be changed into another prime (857426207356487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428713103678193 + 428713103678194.

It is an arithmetic number, because the mean of its divisors is an integer number (428713103678194).

Almost surely, 2^{857426207356387} is an apocalyptic number.

857426207356387 is a deficient number, since it is larger than the sum of its proper divisors (1).

857426207356387 is an equidigital number, since it uses as much as digits as its factorization.

857426207356387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2844979200, while the sum is 73.

The spelling of 857426207356387 in words is "eight hundred fifty-seven trillion, four hundred twenty-six billion, two hundred seven million, three hundred fifty-six thousand, three hundred eighty-seven".