855431999999947 has 2 divisors, whose sum is σ = 855431999999948. Its totient is φ = 855431999999946.

The previous prime is 855431999999923. The next prime is 855432000000001. The reversal of 855431999999947 is 749999999134558.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855431999999947 is a prime.

It is not a weakly prime, because it can be changed into another prime (855431999999047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427715999999973 + 427715999999974.

It is an arithmetic number, because the mean of its divisors is an integer number (427715999999974).

Almost surely, 2^{855431999999947} is an apocalyptic number.

855431999999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

855431999999947 is an equidigital number, since it uses as much as digits as its factorization.

855431999999947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 321415516800, while the sum is 100.

The spelling of 855431999999947 in words is "eight hundred fifty-five trillion, four hundred thirty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".