851989447863 has 24 divisors (see below), whose sum is σ = 1235413138128. Its totient is φ = 565798286592.

The previous prime is 851989447849. The next prime is 851989447963. The reversal of 851989447863 is 368744989158.

851989447863 is a `hidden beast` number, since 8 + 5 + 1 + 9 + 8 + 94 + 478 + 63 = 666.

It is not a de Polignac number, because 851989447863 - 2⁴ = 851989447847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 851989447791 and 851989447800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851989447843) 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, 3262120 + ... + 3513602.

It is an arithmetic number, because the mean of its divisors is an integer number (51475547422).

Almost surely, 2^851989447863 is an apocalyptic number.

851989447863 is a deficient number, since it is larger than the sum of its proper divisors (383423690265).

851989447863 is a wasteful number, since it uses less digits than its factorization.

851989447863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252943 (or 252940 counting only the distinct ones).

The product of its digits is 418037760, while the sum is 72.

The spelling of 851989447863 in words is "eight hundred fifty-one billion, nine hundred eighty-nine million, four hundred forty-seven thousand, eight hundred sixty-three".