86721061806 has 32 divisors (see below), whose sum is σ = 192904586400. Its totient is φ = 28878353280.

The previous prime is 86721061799. The next prime is 86721061813. The reversal of 86721061806 is 60816012768.

It is a happy number.

86721061806 is a `hidden beast` number, since 8 + 6 + 7 + 21 + 0 + 618 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (86721061799) and next prime (86721061813).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 741325 + ... + 850296.

It is an arithmetic number, because the mean of its divisors is an integer number (6028268325).

Almost surely, 2^86721061806 is an apocalyptic number.

86721061806 is an abundant number, since it is smaller than the sum of its proper divisors (106183524594).

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

86721061806 is a wasteful number, since it uses less digits than its factorization.

86721061806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592641 (or 1592635 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 86721061806 in words is "eighty-six billion, seven hundred twenty-one million, sixty-one thousand, eight hundred six".