40165404221 has 4 divisors (see below), whose sum is σ = 40458582492. Its totient is φ = 39872225952.

The previous prime is 40165404203. The next prime is 40165404233. The reversal of 40165404221 is 12240456104.

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 10818288121 + 29347116100 = 104011^2 + 171310^2 .

It is a cyclic number.

It is not a de Polignac number, because 40165404221 - 2¹⁴ = 40165387837 is a prime.

It is a super-2 number, since 2×40165404221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40165494221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146588930 + ... + 146589203.

It is an arithmetic number, because the mean of its divisors is an integer number (10114645623).

Almost surely, 2^40165404221 is an apocalyptic number.

It is an amenable number.

40165404221 is a deficient number, since it is larger than the sum of its proper divisors (293178271).

40165404221 is a wasteful number, since it uses less digits than its factorization.

40165404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293178270.

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 40165404221 in words is "forty billion, one hundred sixty-five million, four hundred four thousand, two hundred twenty-one".