86721910668 has 18 divisors (see below), whose sum is σ = 219213718724. Its totient is φ = 28907303544.

The previous prime is 86721910621. The next prime is 86721910747. The reversal of 86721910668 is 86601912768.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1204470946 + ... + 1204471017.

Almost surely, 2^86721910668 is an apocalyptic number.

It is an amenable number.

86721910668 is an abundant number, since it is smaller than the sum of its proper divisors (132491808056).

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

86721910668 is a wasteful number, since it uses less digits than its factorization.

86721910668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408941973 (or 2408941968 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 86721910668 in words is "eighty-six billion, seven hundred twenty-one million, nine hundred ten thousand, six hundred sixty-eight".