851028795855 has 48 divisors (see below), whose sum is σ = 1687144140864. Its totient is φ = 388742515200.

The previous prime is 851028795853. The next prime is 851028795887. The reversal of 851028795855 is 558597820158.

851028795855 is a `hidden beast` number, since 8 + 510 + 28 + 7 + 95 + 8 + 5 + 5 = 666.

It is not a de Polignac number, because 851028795855 - 2¹ = 851028795853 is a prime.

It is a super-2 number, since 2×851028795855² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 851028795792 and 851028795801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851028795853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 628494 + ... + 1448123.

It is an arithmetic number, because the mean of its divisors is an integer number (35148836268).

Almost surely, 2^851028795855 is an apocalyptic number.

851028795855 is a deficient number, since it is larger than the sum of its proper divisors (836115345009).

851028795855 is a wasteful number, since it uses less digits than its factorization.

851028795855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077936 (or 2077933 counting only the distinct ones).

The product of its (nonzero) digits is 40320000, while the sum is 63.

The spelling of 851028795855 in words is "eight hundred fifty-one billion, twenty-eight million, seven hundred ninety-five thousand, eight hundred fifty-five".