855818481771 has 24 divisors (see below), whose sum is σ = 1353809821104. Its totient is φ = 516659650560.

The previous prime is 855818481767. The next prime is 855818481773. The reversal of 855818481771 is 177184818558.

855818481771 is a `hidden beast` number, since 8 + 5 + 5 + 81 + 8 + 481 + 7 + 71 = 666.

It is not a de Polignac number, because 855818481771 - 2² = 855818481767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855818481699 and 855818481708.

It is not an unprimeable number, because it can be changed into a prime (855818481773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16792906 + ... + 16843791.

It is an arithmetic number, because the mean of its divisors is an integer number (56408742546).

Almost surely, 2^855818481771 is an apocalyptic number.

855818481771 is a deficient number, since it is larger than the sum of its proper divisors (497991339333).

855818481771 is a wasteful number, since it uses less digits than its factorization.

855818481771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33636971 (or 33636968 counting only the distinct ones).

The product of its digits is 20070400, while the sum is 63.

The spelling of 855818481771 in words is "eight hundred fifty-five billion, eight hundred eighteen million, four hundred eighty-one thousand, seven hundred seventy-one".