40165625666 has 8 divisors (see below), whose sum is σ = 60269101500. Its totient is φ = 20075925168.

The previous prime is 40165625657. The next prime is 40165625677. The reversal of 40165625666 is 66652656104.

It can be written as a sum of positive squares in 2 ways, for example, as 37301128225 + 2864497441 = 193135^2 + 53521^2 .

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

It is a super-2 number, since 2×40165625666² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40165625666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3436541 + ... + 3448208.

Almost surely, 2^40165625666 is an apocalyptic number.

40165625666 is a deficient number, since it is larger than the sum of its proper divisors (20103475834).

40165625666 is a wasteful number, since it uses less digits than its factorization.

40165625666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887668.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 40165625666 in words is "forty billion, one hundred sixty-five million, six hundred twenty-five thousand, six hundred sixty-six".