40166021673185 has 4 divisors (see below), whose sum is σ = 48199226007828. Its totient is φ = 32132817338544.

The previous prime is 40166021673157. The next prime is 40166021673187. The reversal of 40166021673185 is 58137612066104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9605778263761 + 30560243409424 = 3099319^2 + 5528132^2 .

It is a cyclic number.

It is not a de Polignac number, because 40166021673185 - 2⁴² = 35767975162081 is a prime.

It is a super-2 number, since 2×40166021673185² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40166021673187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4016602167314 + ... + 4016602167323.

It is an arithmetic number, because the mean of its divisors is an integer number (12049806501957).

Almost surely, 2^{40166021673185} is an apocalyptic number.

It is an amenable number.

40166021673185 is a deficient number, since it is larger than the sum of its proper divisors (8033204334643).

40166021673185 is an equidigital number, since it uses as much as digits as its factorization.

40166021673185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8033204334642.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 40166021673185 in words is "forty trillion, one hundred sixty-six billion, twenty-one million, six hundred seventy-three thousand, one hundred eighty-five".