851769441861 has 12 divisors (see below), whose sum is σ = 1229773632768. Its totient is φ = 524165810064.

The previous prime is 851769441703. The next prime is 851769441877. The reversal of 851769441861 is 168144967158.

It is not a de Polignac number, because 851769441861 - 2⁹ = 851769441349 is a prime.

It is a super-2 number, since 2×851769441861² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 851769441795 and 851769441804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851769441161) 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 11 ways as a sum of consecutive naturals, for example, 840008805 + ... + 840009818.

It is an arithmetic number, because the mean of its divisors is an integer number (102481136064).

Almost surely, 2^851769441861 is an apocalyptic number.

It is an amenable number.

851769441861 is a deficient number, since it is larger than the sum of its proper divisors (378004190907).

851769441861 is a wasteful number, since it uses less digits than its factorization.

851769441861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680018652 (or 1680018639 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 60.

The spelling of 851769441861 in words is "eight hundred fifty-one billion, seven hundred sixty-nine million, four hundred forty-one thousand, eight hundred sixty-one".