855641974427 has 2 divisors, whose sum is σ = 855641974428. Its totient is φ = 855641974426.

The previous prime is 855641974391. The next prime is 855641974457. The reversal of 855641974427 is 724479146558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855641974427 - 2³⁸ = 580764067483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855641974427.

It is not a weakly prime, because it can be changed into another prime (855641974457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427820987213 + 427820987214.

It is an arithmetic number, because the mean of its divisors is an integer number (427820987214).

Almost surely, 2^855641974427 is an apocalyptic number.

855641974427 is a deficient number, since it is larger than the sum of its proper divisors (1).

855641974427 is an equidigital number, since it uses as much as digits as its factorization.

855641974427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67737600, while the sum is 62.

The spelling of 855641974427 in words is "eight hundred fifty-five billion, six hundred forty-one million, nine hundred seventy-four thousand, four hundred twenty-seven".