861908491268 has 12 divisors (see below), whose sum is σ = 1645461665232. Its totient is φ = 391776586920.

The previous prime is 861908491261. The next prime is 861908491291. The reversal of 861908491268 is 862194809168.

It is a self number, because there is not a number n which added to its sum of digits gives 861908491268.

It is not an unprimeable number, because it can be changed into a prime (861908491261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9794414630 + ... + 9794414717.

It is an arithmetic number, because the mean of its divisors is an integer number (137121805436).

Almost surely, 2^861908491268 is an apocalyptic number.

It is an amenable number.

861908491268 is a deficient number, since it is larger than the sum of its proper divisors (783553173964).

861908491268 is a wasteful number, since it uses less digits than its factorization.

861908491268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19588829362 (or 19588829360 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 62.

The spelling of 861908491268 in words is "eight hundred sixty-one billion, nine hundred eight million, four hundred ninety-one thousand, two hundred sixty-eight".