86686172946 has 56 divisors (see below), whose sum is σ = 195214727244. Its totient is φ = 28856852640.

The previous prime is 86686172899. The next prime is 86686172987. The reversal of 86686172946 is 64927168668.

86686172946 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 617 + 2 + 9 + 4 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81031884921 + 5654288025 = 284661^2 + 75195^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1064436 + ... + 1142976.

Almost surely, 2^86686172946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86686172946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97607363622).

86686172946 is an abundant number, since it is smaller than the sum of its proper divisors (108528554298).

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

86686172946 is an equidigital number, since it uses as much as digits as its factorization.

86686172946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79318 (or 79303 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 86686172946 in words is "eighty-six billion, six hundred eighty-six million, one hundred seventy-two thousand, nine hundred forty-six".