861057381866 has 16 divisors (see below), whose sum is σ = 1409421087648. Its totient is φ = 391273580400.

The previous prime is 861057381839. The next prime is 861057381871. The reversal of 861057381866 is 668183750168.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5731085 + ... + 5879408.

It is an arithmetic number, because the mean of its divisors is an integer number (88088817978).

Almost surely, 2^861057381866 is an apocalyptic number.

861057381866 is a deficient number, since it is larger than the sum of its proper divisors (548363705782).

861057381866 is a wasteful number, since it uses less digits than its factorization.

861057381866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11613877.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 861057381866 in words is "eight hundred sixty-one billion, fifty-seven million, three hundred eighty-one thousand, eight hundred sixty-six".