861286696398 has 16 divisors (see below), whose sum is σ = 1913970436560. Its totient is φ = 287095565448.

The previous prime is 861286696393. The next prime is 861286696463. The reversal of 861286696398 is 893696682168.

861286696398 is a `hidden beast` number, since 86 + 12 + 8 + 66 + 96 + 398 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861286696393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7974876765 + ... + 7974876872.

It is an arithmetic number, because the mean of its divisors is an integer number (119623152285).

Almost surely, 2^861286696398 is an apocalyptic number.

861286696398 is an abundant number, since it is smaller than the sum of its proper divisors (1052683740162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861286696398 is a wasteful number, since it uses less digits than its factorization.

861286696398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15949753648 (or 15949753642 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 72.

The spelling of 861286696398 in words is "eight hundred sixty-one billion, two hundred eighty-six million, six hundred ninety-six thousand, three hundred ninety-eight".