40065382081 has 4 divisors (see below), whose sum is σ = 41042586564. Its totient is φ = 39088177600.

The previous prime is 40065382073. The next prime is 40065382087. The reversal of 40065382081 is 18028356004.

It is a happy number.

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 15069772081 + 24995610000 = 122759^2 + 158100^2 .

It is a cyclic number.

It is not a de Polignac number, because 40065382081 - 2³ = 40065382073 is a prime.

It is a super-3 number, since 3×40065382081³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40065382081.

It is not an unprimeable number, because it can be changed into a prime (40065382087) 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, 488602180 + ... + 488602261.

It is an arithmetic number, because the mean of its divisors is an integer number (10260646641).

Almost surely, 2^40065382081 is an apocalyptic number.

40065382081 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40065382081 is a deficient number, since it is larger than the sum of its proper divisors (977204483).

40065382081 is an equidigital number, since it uses as much as digits as its factorization.

40065382081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977204482.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 40065382081 in words is "forty billion, sixty-five million, three hundred eighty-two thousand, eighty-one".