1186863958666 has 4 divisors (see below), whose sum is σ = 1780295938002. Its totient is φ = 593431979332.

The previous prime is 1186863958559. The next prime is 1186863958669. The reversal of 1186863958666 is 6668593686811.

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., 1086137068041 + 100726890625 = 1042179^2 + 317375^2 .

It is not an unprimeable number, because it can be changed into a prime (1186863958669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 296715989665 + ... + 296715989668.

Almost surely, 2^{1186863958666} is an apocalyptic number.

1186863958666 is a deficient number, since it is larger than the sum of its proper divisors (593431979336).

1186863958666 is an equidigital number, since it uses as much as digits as its factorization.

1186863958666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593431979335.

The product of its digits is 537477120, while the sum is 73.

The spelling of 1186863958666 in words is "one trillion, one hundred eighty-six billion, eight hundred sixty-three million, nine hundred fifty-eight thousand, six hundred sixty-six".