40186865666 has 8 divisors (see below), whose sum is σ = 60281496444. Its totient is φ = 20093033520.

The previous prime is 40186865569. The next prime is 40186865687. The reversal of 40186865666 is 66656868104.

It can be written as a sum of positive squares in 2 ways, for example, as 38956890625 + 1229975041 = 197375^2 + 35071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×40186865666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52025 + ... + 288236.

Almost surely, 2^40186865666 is an apocalyptic number.

40186865666 is a deficient number, since it is larger than the sum of its proper divisors (20094630778).

40186865666 is a wasteful number, since it uses less digits than its factorization.

40186865666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399316.

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 40186865666 in words is "forty billion, one hundred eighty-six million, eight hundred sixty-five thousand, six hundred sixty-six".