86861786618 has 4 divisors (see below), whose sum is σ = 130292679930. Its totient is φ = 43430893308.

The previous prime is 86861786587. The next prime is 86861786647. The reversal of 86861786618 is 81668716868.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82844381929 + 4017404689 = 287827^2 + 63383^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21715446653 + ... + 21715446656.

Almost surely, 2^86861786618 is an apocalyptic number.

86861786618 is a deficient number, since it is larger than the sum of its proper divisors (43430893312).

86861786618 is a wasteful number, since it uses less digits than its factorization.

86861786618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43430893311.

The product of its digits is 37158912, while the sum is 65.

The spelling of 86861786618 in words is "eighty-six billion, eight hundred sixty-one million, seven hundred eighty-six thousand, six hundred eighteen".