40165738015666 has 4 divisors (see below), whose sum is σ = 60248607023502. Its totient is φ = 20082869007832.

The previous prime is 40165738015567. The next prime is 40165738015729. The reversal of 40165738015666 is 66651083756104.

40165738015666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 32077259815041 + 8088478200625 = 5663679^2 + 2844025^2 .

It is a super-2 number, since 2×40165738015666² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40165738015666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10041434503915 + ... + 10041434503918.

Almost surely, 2^{40165738015666} is an apocalyptic number.

40165738015666 is a deficient number, since it is larger than the sum of its proper divisors (20082869007836).

40165738015666 is a wasteful number, since it uses less digits than its factorization.

40165738015666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20082869007835.

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 40165738015666 in words is "forty trillion, one hundred sixty-five billion, seven hundred thirty-eight million, fifteen thousand, six hundred sixty-six".