86991167056 has 20 divisors (see below), whose sum is σ = 168631924500. Its totient is φ = 43473251072.

The previous prime is 86991167047. The next prime is 86991167059. The reversal of 86991167056 is 65076119968.

It can be written as a sum of positive squares in 2 ways, for example, as 36328360000 + 50662807056 = 190600^2 + 225084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86991167059) 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, 1363621 + ... + 1425988.

It is an arithmetic number, because the mean of its divisors is an integer number (8431596225).

Almost surely, 2^86991167056 is an apocalyptic number.

It is an amenable number.

86991167056 is a deficient number, since it is larger than the sum of its proper divisors (81640757444).

86991167056 is a wasteful number, since it uses less digits than its factorization.

86991167056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791566 (or 2791560 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 86991167056 in words is "eighty-six billion, nine hundred ninety-one million, one hundred sixty-seven thousand, fifty-six".