863959421956 has 36 divisors (see below), whose sum is σ = 1689556672188. Its totient is φ = 385170753024.

The previous prime is 863959421951. The next prime is 863959421989. The reversal of 863959421956 is 659124959368.

It can be written as a sum of positive squares in 2 ways, for example, as 734733551556 + 129225870400 = 857166^2 + 359480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 863959421891 and 863959421900.

It is not an unprimeable number, because it can be changed into a prime (863959421951) 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, 17572801 + ... + 17621896.

It is an arithmetic number, because the mean of its divisors is an integer number (46932129783).

Almost surely, 2^863959421956 is an apocalyptic number.

It is an amenable number.

863959421956 is a deficient number, since it is larger than the sum of its proper divisors (825597250232).

863959421956 is a wasteful number, since it uses less digits than its factorization.

863959421956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35194756 (or 35194735 counting only the distinct ones).

The product of its digits is 125971200, while the sum is 67.

The spelling of 863959421956 in words is "eight hundred sixty-three billion, nine hundred fifty-nine million, four hundred twenty-one thousand, nine hundred fifty-six".