85855647871951 has 2 divisors, whose sum is σ = 85855647871952. Its totient is φ = 85855647871950.

The previous prime is 85855647871949. The next prime is 85855647872023. The reversal of 85855647871951 is 15917874655858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85855647871951 - 2¹ = 85855647871949 is a prime.

Together with 85855647871949, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85855647871921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42927823935975 + 42927823935976.

It is an arithmetic number, because the mean of its divisors is an integer number (42927823935976).

Almost surely, 2^{85855647871951} is an apocalyptic number.

85855647871951 is a deficient number, since it is larger than the sum of its proper divisors (1).

85855647871951 is an equidigital number, since it uses as much as digits as its factorization.

85855647871951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880000, while the sum is 79.

The spelling of 85855647871951 in words is "eighty-five trillion, eight hundred fifty-five billion, six hundred forty-seven million, eight hundred seventy-one thousand, nine hundred fifty-one".