80686861389 has 12 divisors (see below), whose sum is σ = 119390315772. Its totient is φ = 52479259200.

The previous prime is 80686861351. The next prime is 80686861393. The reversal of 80686861389 is 98316868608.

80686861389 is a `hidden beast` number, since 8 + 0 + 6 + 8 + 6 + 8 + 613 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9541968489 + 71144892900 = 97683^2 + 266730^2 .

It is not a de Polignac number, because 80686861389 - 2²⁵ = 80653306957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80686861319) 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, 109331422 + ... + 109332159.

It is an arithmetic number, because the mean of its divisors is an integer number (9949192981).

Almost surely, 2^80686861389 is an apocalyptic number.

It is an amenable number.

80686861389 is a deficient number, since it is larger than the sum of its proper divisors (38703454383).

80686861389 is a wasteful number, since it uses less digits than its factorization.

80686861389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218663628 (or 218663625 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 63.

The spelling of 80686861389 in words is "eighty billion, six hundred eighty-six million, eight hundred sixty-one thousand, three hundred eighty-nine".